QJEEM19Chd465: JEE Main 2019 Chemistry - Class 11 JEEM19Chd465 Solution: Consider the van der Waals constants, a and b, for the…

Question

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Consider the van der Waals constants, a and b, for the following gases.

Gas	Ar	Ne	Kr	Xe
a/ (atm dm⁶ mol^–2)	1.3	0.2	5.1	4.1
b/ (10^–2 dm³ mol^–1)	3.2	1.7	1.0	5.0

Which gas is expected to have the highest critical temperature?

Accepted Answer

We know,

Critical temperature (T_c) =

\frac{8 a}{27 b R}

∴

T_c

\propto

\frac{a}{b}

So, species with greatest value of

\frac{a}{b}

has greatest value of critical temperature.

Accordig to the given data Kr have highest

\frac{a}{b}

ratio.

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