The Solid State

01

PYQ 2026

medium

physics ID: wbjee-20

The coagulating power of electrolytes having ions Na, Al and Ba for As S sol increases in the order}

1

$Al Ba Na$

2

$Na Ba Al$

3

$Ba Na Al$

4

$Al Na Ba$

Official Solution

Correct Option: (2)

$Concept: According to Hardy-Schulze rule: Coagulating power depends on valency of oppositely charged ion Higher charge greater coagulation Step 1: Nature of sol As S sol is negatively charged. Thus, cations act as coagulating ions. Step 2: Compare valencies Na (1) Ba (2) Al (3) Higher charge higher coagulating power. Conclusion:$

02

PYQ 2026

medium

physics ID: wbjee-20

$P and Q combine to form two compounds and . If 1 g in 51 g benzene gives depression of freezing point and 1 g gives . (). Find atomic masses of P and Q.$

1

$35, 55$

2

$45, 45$

3

$55, 45$

4

$55, 35$

Official Solution

Correct Option: (4)

$Concept: Freezing point depression: Here solvent mass same ⇒ Step 1: {\color{red}Molar mass ratio.} Step 2: {\color{red}Let atomic masses.} Let P = , Q = . Step 3: {\color{red}Use ratio.} Step 4: {\color{red}Match options.} Closest integer ratio:$

03

PYQ 2026

medium

physics ID: wbjee-20

$If three elements A, B, C crystallise in a cubic lattice with B at cube centres, C at edge centres and A at corners, the formula of the compound is$

1

2

3

4

Official Solution

Correct Option: (1)

$Concept: Effective atoms in unit cell Corner atoms: Body centre: Edge centres: Ratio: But given options, inverted order \to .$

High-Yield Trend

Chapter Questions
3 MCQs

Official Solution

Official Solution

Official Solution

The Solid State

High-Yield Trend

Chapter Questions 3 MCQs

Official Solution

Official Solution

Official Solution

Chapter Questions
3 MCQs