WB JEE 2021 | Liquid Solution Question 5 | Chemistry

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

When 20 g of naphthoic acid (C₁₁H₈O₂) is dissolved in 50 g of benzene, a freezing point depression of 2K is observed. The van't Hoff factor (i) is [K_f = 1.72 K kg mol^$$-$$1]

0.5

1.0

2.0

3.0

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

Equal masses of ethane and hydrogen are mixed in an empty container at 298 K. The fraction of total pressure exerted by hydrogen is

15:16

1:1

1:4

1:6

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

K_f (water) = 1.86 K kg mol^-1. The temperature at which ice begins to separate from a mixture of 10 mass % ethylene glycol is

$$ - $$1.86 $$^\circ $$C

$$ - $$3.72 $$^\circ $$C

$$ - $$3.3 $$^\circ $$C

$$ - $$3 $$^\circ $$C

WB JEE 2018

MCQ (Single Correct Answer)

-0.33

Equal weights of ethane and hydrogen are mixed in an empty container at 25$$^\circ$$C. The fraction of total pressure exerted by hydrogen is

1 : 2

1 : 1

1 : 16

15 : 16

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