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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Chemistry
Chapter: States of Matter

NTA Abhyas 2020 · Chemistry · States of Matter

The critical constants P _ C T _ C for methane are 45atm and 180K ....

The critical constants

{P}_{C} {T}_{C}

for methane are

45atm

and

180K

. The correct statement is -

Options

A ${V}_{C} = 2.4L$
B $b = 0.04L / mol$
C ${V}_{C} = 0.8L$
D $b = 0.8L / mol$

Correct answer

B. $b = 0.04L / mol$

Step-by-step solution

The critical constants

{P}_{C} {T}_{C}

for methane are

45atm

and

180K

.
Therefore,

{P}_{C} \text{=}\dfrac{a}{{\text{27b}^{2}}

,

{T}_{C} \text{=}\dfrac{\text{8a}}{\text{27 Rb}}

⇒ \dfrac{{P}_{C}}{{T}_{C}} = \dfrac{R}{8b}

⇒ b = 0.04\dfrac{L}{mol}

.

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