KCET PYQ CHEMISTRY 12-1-3

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Stability ∝ Size and intermolecular forces.

📚 Problem Solving Strategy

Macromolecular colloids are stable due to their large size and intermolecular forces.

Stability of macromolecular colloids prevents easy coagulation.

Final result: Macromolecular colloids cannot be easily coagulated.

⚠️ Common Mistakes

Confusing stability of colloids based on types.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Relate stability of colloids to their molecular structures.

This is some text inside of a div block.

💡 Key Formula

Stability ∝ Size and intermolecular forces.

📚 Problem Solving Strategy

Macromolecular colloids are stable due to their large size and intermolecular forces.

Stability of macromolecular colloids prevents easy coagulation.

Final result: Macromolecular colloids cannot be easily coagulated.

⚠️ Common Mistakes

Confusing stability of colloids based on types.

The electrolyte having maximum flocculation value for AgI/Ag⁺ sol. is...

NaCl

Na₂S

Na₂SO₄

Na₃PO₄

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Flocculation value ∝ 1/(charge).

📚 Problem Solving Strategy

Flocculation value is inversely proportional to coagulating power.

NaCl has the lowest charge (minimum coagulating power) and hence the highest flocculation value.

Final result: Maximum flocculation value = NaCl.

⚠️ Common Mistakes

Confusing coagulating power with flocculation value directly.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Relate charge of ions to flocculation and coagulating power.

This is some text inside of a div block.

💡 Key Formula

Flocculation value ∝ 1/(charge).

📚 Problem Solving Strategy

Flocculation value is inversely proportional to coagulating power.

NaCl has the lowest charge (minimum coagulating power) and hence the highest flocculation value.

Final result: Maximum flocculation value = NaCl.

⚠️ Common Mistakes

Confusing coagulating power with flocculation value directly.

Sodium metal crystallizes in B.C.C. lattice with edge length = 4.29 Å. Radius of sodium atom is...

2.857 Å

1.601 Å

2.145 Å

1.857 Å

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

r = 0.433 x edge length

📚 Problem Solving Strategy

Radius in BCC: r = 0.433a; a = 4.29 Å.

Calculate r = 0.433 x 4.29 = 1.857 Å.

Final result: Radius = 1.857 Å.

⚠️ Common Mistakes

Miscomputing radius by using incorrect lattice constant.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Carefully compute radius using BCC lattice formula.

This is some text inside of a div block.

💡 Key Formula

r = 0.433 x edge length

📚 Problem Solving Strategy

Radius in BCC: r = 0.433a; a = 4.29 Å.

Calculate r = 0.433 x 4.29 = 1.857 Å.

Final result: Radius = 1.857 Å.

⚠️ Common Mistakes

Miscomputing radius by using incorrect lattice constant.

Process responsible for delta formation where rivers meet sea is

Coagulation

Colloid formation

Emulsification

Peptization

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Colloid + electrolyte

📚 Problem Solving Strategy

Consider particle behavior

Check electrolyte effect

Identify process

⚠️ Common Mistakes

Process identification

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Salt causes coagulation

This is some text inside of a div block.

💡 Key Formula

Colloid + electrolyte

📚 Problem Solving Strategy

Consider particle behavior

Check electrolyte effect

Identify process

⚠️ Common Mistakes

Process identification

The unit cell with crystallographic dimensions, a ≠ b ≠ c, α = γ = 90° and β ≠ 90° is...

Triclinic

Monoclinic

Orthorhombic

Tetragonal

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Monoclinic: a ≠ b ≠ c, α = γ = 90°, β ≠ 90°.

📚 Problem Solving Strategy

Crystallographic dimensions and angles suggest a monoclinic unit cell.

Confirm a ≠ b ≠ c, α = γ = 90°, β ≠ 90° corresponds to monoclinic system.

Final result: Unit cell is monoclinic.

⚠️ Common Mistakes

Misinterpreting parameters as orthorhombic or tetragonal.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Carefully match crystallographic parameters to crystal systems.

This is some text inside of a div block.

💡 Key Formula

Monoclinic: a ≠ b ≠ c, α = γ = 90°, β ≠ 90°.

📚 Problem Solving Strategy

Crystallographic dimensions and angles suggest a monoclinic unit cell.

Confirm a ≠ b ≠ c, α = γ = 90°, β ≠ 90° corresponds to monoclinic system.

Final result: Unit cell is monoclinic.

⚠️ Common Mistakes

Misinterpreting parameters as orthorhombic or tetragonal.

Schottky defect in a crystal is observed when

Unequal number of cations and anions are missing from the lattice

Equal number of cations and anions are missing from the lattice

An ion leaves its normal site and occupies an interstitial site

No ion is missing from its lattice site

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

None required

📚 Problem Solving Strategy

Define Schottky defect

Note requirement for electrical neutrality

Confirm equal missing ions

⚠️ Common Mistakes

Confusing with Frenkel defect

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Think about charge balance

This is some text inside of a div block.

💡 Key Formula

None required

📚 Problem Solving Strategy

Define Schottky defect

Note requirement for electrical neutrality

Confirm equal missing ions

⚠️ Common Mistakes

Confusing with Frenkel defect

Which is not favorable for physical adsorption?

High temperature

High pressure

Higher critical T of adsorbate

Low temperature

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

ΔH < 0 (exothermic)

📚 Problem Solving Strategy

Consider exothermic nature

Check Le Chatelier's

Identify unfavorable

⚠️ Common Mistakes

Temperature effect

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Heat opposes adsorption

This is some text inside of a div block.

💡 Key Formula

ΔH < 0 (exothermic)

📚 Problem Solving Strategy

Consider exothermic nature

Check Le Chatelier's

Identify unfavorable

⚠️ Common Mistakes

Temperature effect

Correct statement about defect in solids is

Frenkel: small size difference

Frenkel is dislocation

Protons trap: F-centers

Schottky: no effect

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Frenkel defect equation

📚 Problem Solving Strategy

Compare defects

Check characteristics

Identify correct

⚠️ Common Mistakes

Defect types

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Cation displacement

This is some text inside of a div block.

💡 Key Formula

Frenkel defect equation

📚 Problem Solving Strategy

Compare defects

Check characteristics

Identify correct

⚠️ Common Mistakes

Defect types

In a face centered cubic arrangement of A and B atoms in which 'A' atoms are at the corners of the unit cell and 'B' atoms are at the face centers, one of the 'A' atoms is missing from one corner in the unit cell. The simplest formula of the compound is

A₇B₂₄

A₇B₈

AB₃

A₇B₃

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

A₇B₂₄

📚 Problem Solving Strategy

For A: 7 corners × 1/8 = 7/8

For B: 6 faces × 1/2 = 3

Ratio A:B = 7/8:3 = 7:24

⚠️ Common Mistakes

Corner/face contribution calculation

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Count contributions

This is some text inside of a div block.

💡 Key Formula

A₇B₂₄

📚 Problem Solving Strategy

For A: 7 corners × 1/8 = 7/8

For B: 6 faces × 1/2 = 3

Ratio A:B = 7/8:3 = 7:24

⚠️ Common Mistakes

Corner/face contribution calculation

Gold sol is not a

Lyophobic sol

Negatively charged sol

Macromolecular sol

Multimolecular colloid

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Au + reducing agent → Au sol

📚 Problem Solving Strategy

Identify colloid type

Check particle size

Consider formation

⚠️ Common Mistakes

Confusion between different types of sols

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Gold forms multimolecular colloid

This is some text inside of a div block.

💡 Key Formula

Au + reducing agent → Au sol

📚 Problem Solving Strategy

Identify colloid type

Check particle size

Consider formation

⚠️ Common Mistakes

Confusion between different types of sols

Which crystal has unit cells with a≠b≠c and α≠β≠90°?

K₂Cr₂O₇

NaNO₃

KNO₃

K₂SO₄

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

a≠b≠c, α≠β≠γ≠90°

📚 Problem Solving Strategy

Check crystal systems

Compare parameters

Identify triclinic

⚠️ Common Mistakes

Crystal systems

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Triclinic system

This is some text inside of a div block.

💡 Key Formula

a≠b≠c, α≠β≠γ≠90°

📚 Problem Solving Strategy

Check crystal systems

Compare parameters

Identify triclinic

⚠️ Common Mistakes

Crystal systems

Edge length of a cube is 300 pm. Its body diagonal would be

600 pm

423 pm

519.6 pm

450.5 pm

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

d = a√3 where a = edge length

📚 Problem Solving Strategy

Apply Pythagorean theorem

Consider cubic structure

Calculate diagonal

⚠️ Common Mistakes

Students forget √3 factor

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Body diagonal = a√3

This is some text inside of a div block.

💡 Key Formula

d = a√3 where a = edge length

📚 Problem Solving Strategy

Apply Pythagorean theorem

Consider cubic structure

Calculate diagonal

⚠️ Common Mistakes

Students forget √3 factor

In F.C.C. the cell is shared equally by how many unit cells?

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Face atoms = 6, sharing = 1/2

📚 Problem Solving Strategy

Count face atoms

Calculate sharing

Apply crystal rules

⚠️ Common Mistakes

Students forget partial sharing of atoms

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Each face atom shared by 2 cells

This is some text inside of a div block.

💡 Key Formula

Face atoms = 6, sharing = 1/2

📚 Problem Solving Strategy

Count face atoms

Calculate sharing

Apply crystal rules

⚠️ Common Mistakes

Students forget partial sharing of atoms

Which of the following electrolytes will have maximum coagulating value for AgI/Ag⁺ sol?

Na₂S

Na₃PO₄

Na₂SO₄

NaCl

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

1/coagulating power ∝ z⁶

📚 Problem Solving Strategy

Compare ion charges

Consider Schulze-Hardy rule

Evaluate coagulating power

⚠️ Common Mistakes

Confusion between charge and coagulating power

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Lower charge = higher value

This is some text inside of a div block.

💡 Key Formula

1/coagulating power ∝ z⁶

📚 Problem Solving Strategy

Compare ion charges

Consider Schulze-Hardy rule

Evaluate coagulating power

⚠️ Common Mistakes

Confusion between charge and coagulating power

1 mole NaCl doped with 10⁻⁵ mole SrCl₂. Number of cationic vacancies in crystal lattice

6.022×10¹⁸

6.022×10¹⁵

6.022×10²³

12.044×10²⁰

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Vacancies = NA × moles of Sr²⁺

📚 Problem Solving Strategy

Write substitution equation

Calculate vacancies per Sr²⁺

Multiply by Avogadro number

⚠️ Common Mistakes

Not considering charge balance

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

One Sr²⁺ creates one vacancy

This is some text inside of a div block.

💡 Key Formula

Vacancies = NA × moles of Sr²⁺

📚 Problem Solving Strategy

Write substitution equation

Calculate vacancies per Sr²⁺

Multiply by Avogadro number

⚠️ Common Mistakes

Not considering charge balance

Number of atoms in 2.4g of BCC crystal with edge length 200pm is (density=10g/cm³, NA=6×10²³)

6×10²²

6×10²⁰

6×10²³

6×10¹⁹

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

n = mNA/M

📚 Problem Solving Strategy

Calculate volume and mass

Find number of atoms per unit cell

Convert to total atoms

⚠️ Common Mistakes

Not considering atoms per unit cell

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Use density and atomic mass

This is some text inside of a div block.

💡 Key Formula

n = mNA/M

📚 Problem Solving Strategy

Calculate volume and mass

Find number of atoms per unit cell

Convert to total atoms

⚠️ Common Mistakes

Not considering atoms per unit cell

Which is a network crystalline solid?

I₂

AlN

NaCl

Ice

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Al-N-Al-N network

📚 Problem Solving Strategy

Check bonding type

Verify 3D network

Confirm covalent network

⚠️ Common Mistakes

Confusing ionic with network solids

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Look for extended covalent bonds

This is some text inside of a div block.

💡 Key Formula

Al-N-Al-N network

📚 Problem Solving Strategy

Check bonding type

Verify 3D network

Confirm covalent network

⚠️ Common Mistakes

Confusing ionic with network solids

Which cleansing agent gets precipitated in hard water?

Sodium lauryl sulphate

Sodium stearate

Cetyl trimethyl ammonium bromide

Sodium dodecyl benzene sulphonate

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

C₁₇H₃₅COONa + Ca²⁺ → (C₁₇H₃₅COO)₂Ca↓

📚 Problem Solving Strategy

Consider reaction of cleansing agents with Ca²⁺/Mg²⁺ ions

Sodium stearate forms insoluble calcium/magnesium stearate

Soap (sodium stearate) forms precipitate with hard water ions

⚠️ Common Mistakes

Students often don't consider the ionic nature of soap-hard water interaction

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Think about traditional soap behavior in hard water

This is some text inside of a div block.

💡 Key Formula

C₁₇H₃₅COONa + Ca²⁺ → (C₁₇H₃₅COO)₂Ca↓

📚 Problem Solving Strategy

Consider reaction of cleansing agents with Ca²⁺/Mg²⁺ ions

Sodium stearate forms insoluble calcium/magnesium stearate

Soap (sodium stearate) forms precipitate with hard water ions

⚠️ Common Mistakes

Students often don't consider the ionic nature of soap-hard water interaction

Critical Micelle Concentration for soap solution is 1.5×10⁻⁴ mol L⁻¹. Micelle formation possible when concentration in mol L⁻¹ is

2.0×10⁻³

4.6×10⁻⁵

7.5×10⁻⁵

1.1×10⁻⁴

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

[Soap] > CMC for micelles

📚 Problem Solving Strategy

Compare with CMC

Check concentration

Verify micelle formation

⚠️ Common Mistakes

Not comparing with CMC value

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Concentration must exceed CMC

This is some text inside of a div block.

💡 Key Formula

[Soap] > CMC for micelles

📚 Problem Solving Strategy

Compare with CMC

Check concentration

Verify micelle formation

⚠️ Common Mistakes

Not comparing with CMC value

During adsorption of a gas on a solid

ΔG<0, ΔH<0, ΔS<0

ΔG>0, ΔH>0, ΔS>0

ΔG<0, ΔH<0, ΔS>0

ΔG<0, ΔH>0, ΔS>0

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

ΔG = ΔH - TΔS

📚 Problem Solving Strategy

Check spontaneity

Analyze enthalpy change

Consider entropy change

⚠️ Common Mistakes

Thermodynamic parameters

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Spontaneous process with decreased randomness

This is some text inside of a div block.

💡 Key Formula

ΔG = ΔH - TΔS

📚 Problem Solving Strategy

Check spontaneity

Analyze enthalpy change

Consider entropy change

⚠️ Common Mistakes

Thermodynamic parameters

When a sol of AgI is prepared by mixing equal volumes of 0.1M AgNO₃ and 0.2M KI, which statement is correct?

Sol obtained is negative with NO₃⁻ adsorbed

Sol obtained is positive with Ag⁺ adsorbed

Sol obtained is positive with K⁺ adsorbed

Sol obtained is negative with I⁻ adsorbed

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

None

📚 Problem Solving Strategy

Check concentrations

Identify excess ions

Determine adsorption

⚠️ Common Mistakes

Colloidal properties

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Excess I⁻ forms negative sol

This is some text inside of a div block.

💡 Key Formula

None

📚 Problem Solving Strategy

Check concentrations

Identify excess ions

Determine adsorption

⚠️ Common Mistakes

Colloidal properties

When silicon is doped with gallium, it forms

n-type semiconductor

both n and p type semiconductor

intrinsic semiconductor

p-type semiconductor

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

None

📚 Problem Solving Strategy

Compare valence electrons

Check hole formation

Identify type

⚠️ Common Mistakes

Semiconductor types

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Ga has fewer valence electrons

This is some text inside of a div block.

💡 Key Formula

None

📚 Problem Solving Strategy

Compare valence electrons

Check hole formation

Identify type

⚠️ Common Mistakes

Semiconductor types

A metal crystallises in face centred cubic structure with metallic radius √2Å. The volume of the unit cell (in m³) is

4×10⁻¹⁰

6.4×10⁻²⁹

4×10⁻⁹

6.4×10⁻³⁰

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

V = a³, a = 4r/√2

📚 Problem Solving Strategy

Calculate edge length

Find unit cell volume

Convert units

⚠️ Common Mistakes

Unit cell calculations

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Use FCC formula

This is some text inside of a div block.

💡 Key Formula

V = a³, a = 4r/√2

📚 Problem Solving Strategy

Calculate edge length

Find unit cell volume

Convert units

⚠️ Common Mistakes

Unit cell calculations

A metal exists as an oxide with formula M₀.₉₆O. Metal M can exist as M²⁺ and M³⁺ in its oxide M₀.₉₆O. The percentage of M³⁺ in the oxide is nearly

8.30%

4.60%

9.60%

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

M²⁺ + M³⁺ total charge = O²⁻ charge

📚 Problem Solving Strategy

Balance charges

Calculate ion ratio

Find percentage

⚠️ Common Mistakes

Oxidation states

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Use charge neutrality

This is some text inside of a div block.

💡 Key Formula

M²⁺ + M³⁺ total charge = O²⁻ charge

📚 Problem Solving Strategy

Balance charges

Calculate ion ratio

Find percentage

⚠️ Common Mistakes

Oxidation states

Which can adsorb larger amount of hydrogen gas?

Finely divided platinum

Colloidal Fe(OH)₃

Finely divided nickel

Colloidal solution of palladium

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Adsorption ∝ Surface Area

📚 Problem Solving Strategy

Compare surface area of different adsorbents

Consider metallic nature and surface activity

Palladium has highest H₂ adsorption capacity

⚠️ Common Mistakes

Confusing physical and chemical adsorption

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Surface area and nature of metal affect adsorption

This is some text inside of a div block.

💡 Key Formula

Adsorption ∝ Surface Area

📚 Problem Solving Strategy

Compare surface area of different adsorbents

Consider metallic nature and surface activity

Palladium has highest H₂ adsorption capacity

⚠️ Common Mistakes

Confusing physical and chemical adsorption

Which of the following is NOT true about the amorphous solids?

Amorphous solids can be moulded by heating

They are anisotropic in nature

On heating they may become crystalline at certain temperature

They may become crystalline on keeping for long time

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Amorphous vs Crystalline properties

📚 Problem Solving Strategy

Compare properties

Identify incorrect statement

Amorphous solids are isotropic

⚠️ Common Mistakes

Confusing isotropic and anisotropic

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Properties same in all directions

This is some text inside of a div block.

💡 Key Formula

Amorphous vs Crystalline properties

📚 Problem Solving Strategy

Compare properties

Identify incorrect statement

Amorphous solids are isotropic

⚠️ Common Mistakes

Confusing isotropic and anisotropic

Alkali halides do not show dislocation defect because

Cations and anions have almost equal size

There is large difference in size of cations and anions

Cations and anions have low co-ordination number

Anions cannot be accommodated in vacant spaces

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Frenkel defect requirements

📚 Problem Solving Strategy

Consider ionic sizes

Understand Frenkel defect

Size difference prevents movement

⚠️ Common Mistakes

Confusing different defect types

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Large size difference prevents defect

This is some text inside of a div block.

💡 Key Formula

Frenkel defect requirements

📚 Problem Solving Strategy

Consider ionic sizes

Understand Frenkel defect

Size difference prevents movement

⚠️ Common Mistakes

Confusing different defect types

How many number of atoms are there in a cube based unit cell, having one atom on each corner and 2 atom on each body diagonal of cube?

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Total = (8×1/8) + 3×2 = 7

📚 Problem Solving Strategy

Count corner atoms

Add body diagonal atoms

Consider shared atoms

⚠️ Common Mistakes

Forgetting to count shared atoms

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Corner atoms contribute 1/8th

This is some text inside of a div block.

💡 Key Formula

Total = (8×1/8) + 3×2 = 7

📚 Problem Solving Strategy

Count corner atoms

Add body diagonal atoms

Consider shared atoms

⚠️ Common Mistakes

Forgetting to count shared atoms

Vacant space in body centered cubic lattice unit cell is about

23%

46%

32%

10%

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

% vacant space = 100 - % packing efficiency

📚 Problem Solving Strategy

Calculate volume of atoms

Compare with unit cell volume

Calculate percentage space

⚠️ Common Mistakes

Confusing different lattice types

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Packing efficiency = 68%

This is some text inside of a div block.

💡 Key Formula

% vacant space = 100 - % packing efficiency

📚 Problem Solving Strategy

Calculate volume of atoms

Compare with unit cell volume

Calculate percentage space

⚠️ Common Mistakes

Confusing different lattice types

A metal crystallises in a body centered cubic lattice with metallic radius √3Å. The volume of unit cell in m³ is

6.4×10⁻²⁹

4×10⁻¹⁰

64×10⁻²⁹

4×10⁻²⁹

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

V = a³

📚 Problem Solving Strategy

Calculate edge length

Find volume

Convert units

⚠️ Common Mistakes

Unit conversion confusion

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

a = 4r/√3

This is some text inside of a div block.

💡 Key Formula

V = a³

📚 Problem Solving Strategy

Calculate edge length

Find volume

Convert units

⚠️ Common Mistakes

Unit conversion confusion

Colloidal solution commonly used in the treatment of skin disease is

Colloidal Gold

Colloidal Antimony

Colloidal Sulphur

Colloidal Silver

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

N/A

📚 Problem Solving Strategy

Identify medical applications of colloids

Sulphur has antiseptic properties

Colloidal sulphur is used in dermatology

⚠️ Common Mistakes

Confusing different colloidal solutions' applications

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Colloidal solutions have medicinal applications

This is some text inside of a div block.

💡 Key Formula

N/A

📚 Problem Solving Strategy

Identify medical applications of colloids

Sulphur has antiseptic properties

Colloidal sulphur is used in dermatology

⚠️ Common Mistakes

Confusing different colloidal solutions' applications

Match Column A (type of crystalline solid) with Column B (example): P.Molecular Solid-i.SiC, Q.Ionic Solid-ii.Mg, R.Metallic Solid-iii.H₂O, S.Network Solid-iv.MgO

P-ii, Q-iv, R-iii, S-i

P-iii, Q-IV, R-ii, S-i

P-iii, Q-i, R-ii, S-iv

P-iv, Q-iii, R-ii, S-i

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Types of solids

📚 Problem Solving Strategy

Identify solid type

Match examples

Verify properties

⚠️ Common Mistakes

Property classification confusion

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Consider bonding type

This is some text inside of a div block.

💡 Key Formula

Types of solids

📚 Problem Solving Strategy

Identify solid type

Match examples

Verify properties

⚠️ Common Mistakes

Property classification confusion

If 'a' stands for edge length of cubic systems - The ratio of radii in simple cubic, body centered cubic and face centered cubic unit cells is

a/2 : a√3/2 : a√2/2

a/2 : a√3a : a/√2

a : √3a : √2a

a/2 : √3/4 : a/2√2

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

r(sc):r(bcc):r(fcc)

📚 Problem Solving Strategy

Compare structures

Calculate radii

Find ratio

⚠️ Common Mistakes

Radius ratio confusion

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

r = f×a

This is some text inside of a div block.

💡 Key Formula

r(sc):r(bcc):r(fcc)

📚 Problem Solving Strategy

Compare structures

Calculate radii

Find ratio

⚠️ Common Mistakes

Radius ratio confusion

For Freundlich isotherm, graph of log(x/m) vs log(P) slope and intercept are

log(1/n), logK

1/n, K

log(1/n), K

1/n, logK

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

log(x/m) = 1/n log P + log K

📚 Problem Solving Strategy

Write Freundlich equation

Take log both sides

Identify slope-intercept

⚠️ Common Mistakes

Confusion in log forms

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Use y=mx+c form

This is some text inside of a div block.

💡 Key Formula

log(x/m) = 1/n log P + log K

📚 Problem Solving Strategy

Write Freundlich equation

Take log both sides

Identify slope-intercept

⚠️ Common Mistakes

Confusion in log forms

In raw sugar decolorization with animal charcoal, identify correct terminology

Animal Charcoal-Colouring Substance-Adsorption

Colouring Substance-Animal Charcoal-Adsorption

Solution of Sugar-Animal Charcoal-Sorption

Animal Charcoal-Solution of Sugar-Absorption

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Physical Adsorption

📚 Problem Solving Strategy

Identify adsorbent

Identify adsorbate

Identify process

⚠️ Common Mistakes

Confusion between adsorption/absorption

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Surface phenomenon

This is some text inside of a div block.

💡 Key Formula

Physical Adsorption

📚 Problem Solving Strategy

Identify adsorbent

Identify adsorbate

Identify process

⚠️ Common Mistakes

Confusion between adsorption/absorption

Which one of the following is a cationic detergent?

Cetyltrimethylammonium bromide

Sodium dodecylbenzene sulfonate

Dodecylbenzene sulfonic acid

Dodecylbenzene

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

No specific formula.

📚 Problem Solving Strategy

Cetyltrimethylammonium bromide is a cationic detergent due to its positively charged quaternary ammonium group.

Other options are anionic detergents or non-detergent molecules.

Final result: Cationic detergent is Cetyltrimethylammonium bromide.

⚠️ Common Mistakes

Confusing cationic detergents with anionic or neutral compounds.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Relate cationic detergents to their functional groups.

This is some text inside of a div block.

💡 Key Formula

No specific formula.

📚 Problem Solving Strategy

Cetyltrimethylammonium bromide is a cationic detergent due to its positively charged quaternary ammonium group.

Other options are anionic detergents or non-detergent molecules.

Final result: Cationic detergent is Cetyltrimethylammonium bromide.

⚠️ Common Mistakes

Confusing cationic detergents with anionic or neutral compounds.

Which of the following crystals has the unit cell such that a = b ≠ c and α = β = 90°, γ = 120°?

Zinc blende

Graphite

Cinnabar

Potassium dichromate

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

No formula involved.

📚 Problem Solving Strategy

The unit cell described corresponds to a hexagonal lattice structure.

Graphite has a layered hexagonal structure, meeting the given conditions.

Graphite satisfies a = b ≠ c and α = β = 90°, γ = 120°.

⚠️ Common Mistakes

Confusing between unit cell parameters for hexagonal and tetragonal structures.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Recall the geometry of different crystal lattices.

This is some text inside of a div block.

💡 Key Formula

No formula involved.

📚 Problem Solving Strategy

The unit cell described corresponds to a hexagonal lattice structure.

Graphite has a layered hexagonal structure, meeting the given conditions.

Graphite satisfies a = b ≠ c and α = β = 90°, γ = 120°.

⚠️ Common Mistakes

Confusing between unit cell parameters for hexagonal and tetragonal structures.

For the coagulation of positively charged ferric oxide sol, flocculating power order is:

PO₄³⁻ > SO₄²⁻ > Cl⁻ > [Fe(CN)₆]³⁻

[Fe(CN)₆]³⁻ > PO₄³⁻ > SO₄²⁻ > Cl⁻

SO₄²⁻ = Cl⁻ = PO₄³⁻ = [Fe(CN)₆]³⁻

SO₄²⁻ > Cl⁻ > PO₄³⁻ > [Fe(CN)₆]³⁻

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

Flocculation ∝ ion charge.

📚 Problem Solving Strategy

Flocculating power is proportional to the charge of ions (Schulze-Hardy rule).

High-charge ions (e.g., [Fe(CN)₆]³⁻) exhibit greater coagulating power than low-charge ions.

Final Answer: Option B is correct.

⚠️ Common Mistakes

Overlooking the impact of ion charge on coagulation.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Recall the relationship between charge and coagulation.

This is some text inside of a div block.

💡 Key Formula

Flocculation ∝ ion charge.

📚 Problem Solving Strategy

Flocculating power is proportional to the charge of ions (Schulze-Hardy rule).

High-charge ions (e.g., [Fe(CN)₆]³⁻) exhibit greater coagulating power than low-charge ions.

Final Answer: Option B is correct.

⚠️ Common Mistakes

Overlooking the impact of ion charge on coagulation.

MnO exhibits:

Ferrimagnetism

Antiferromagnetism

Ferromagnetism

Paramagnetism

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

No formula involved.

📚 Problem Solving Strategy

MnO exhibits antiferromagnetism due to its arrangement of magnetic moments in opposite directions.

Magnetic moments in MnO cancel out, resulting in no net magnetic moment.

Final conclusion: MnO is antiferromagnetic.

⚠️ Common Mistakes

Assuming MnO has paramagnetic properties like Mn ions.

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Recall magnetic properties and arrangements of magnetic moments.

This is some text inside of a div block.

💡 Key Formula

No formula involved.

📚 Problem Solving Strategy

MnO exhibits antiferromagnetism due to its arrangement of magnetic moments in opposite directions.

Magnetic moments in MnO cancel out, resulting in no net magnetic moment.

Final conclusion: MnO is antiferromagnetic.

⚠️ Common Mistakes

Assuming MnO has paramagnetic properties like Mn ions.

The number of atoms in 4.5 g of a face-centred cubic crystal with edge length 300 pm is...

6.6 × 10^20

6.6 × 10^23

6.6 × 10^19

6.6 × 10^22

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

d = (Z × M) / (Na × a³).

📚 Problem Solving Strategy

Use the formula d = (Z × M) / (Na × a³) to find the density of the unit cell.

Substituting values: d = 10, a = 300 pm, Na = 6.022 × 10^23, Z = 4, M = 40.5 g/mol.

Result: Number of atoms = 6.6 × 10^22.

⚠️ Common Mistakes

Miscalculating Z or misinterpreting the given edge length (pm to cm).

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Focus on unit cell dimensions and atomic packing.

This is some text inside of a div block.

💡 Key Formula

d = (Z × M) / (Na × a³).

📚 Problem Solving Strategy

Use the formula d = (Z × M) / (Na × a³) to find the density of the unit cell.

Substituting values: d = 10, a = 300 pm, Na = 6.022 × 10^23, Z = 4, M = 40.5 g/mol.

Result: Number of atoms = 6.6 × 10^22.

⚠️ Common Mistakes

Miscalculating Z or misinterpreting the given edge length (pm to cm).

Identify the incorrect statement regarding colloidal solutions:

Colligative properties are smaller for colloids.

Tyndall effect depends on particle size.

Colour depends on scattered light.

Brownian movement is due to balanced bombardment.

🥳 Wohoo! Correct answer

This is some text inside of a div block.

💡 Key Formula

No formula involved.

📚 Problem Solving Strategy

Brownian movement is caused by unbalanced molecular bombardment.

Correct the misunderstanding about balanced versus unbalanced forces in colloids.

Final Answer: Brownian movement is unbalanced, not balanced.

⚠️ Common Mistakes

Confusing the reason for Brownian motion (balanced vs. unbalanced forces).

😢 Uh oh! Incorrect answer, Try again

🗝 Hint

Review molecular behavior in colloids.

This is some text inside of a div block.

💡 Key Formula

No formula involved.

📚 Problem Solving Strategy

Brownian movement is caused by unbalanced molecular bombardment.

Correct the misunderstanding about balanced versus unbalanced forces in colloids.

Final Answer: Brownian movement is unbalanced, not balanced.

⚠️ Common Mistakes

Confusing the reason for Brownian motion (balanced vs. unbalanced forces).