Question

Consider the following real gases:

$Ne,S{F}_6,N{H}_3,Xe{F}_4$

Now, select the incorrect statement about three gases:

• A. vander Waal's constant 'a' is lowest for Ne
• B. vander Waal's constant 'b' is lowest for $S{F}_6$
• C. $N{H}_3$ gas has highest critical temperature
• D. $Xe{F}_4$ has highest density under identical conditions of pressure and temperature

Answer 1

The correct option is B vander Waal's constant 'b' is lowest for $S{F}_6$

Vander waal's constant ${}^{\prime }{a}^{\prime }$ provides correction term for intermolecular forces. Larger the value of ${}^{\prime }{a}^{\prime }$, larger will be the inter molecular force of attraction. SInce $Ne$ has the least magnitude of intermolecular attraction force, ${}^{\prime }{a}^{\prime }$ will be lowest for it.