At a given temperature T, gases Ne, Ar, Xe and Kr are found to deviate from ideal gas behaviour. Their equation of state is given as

$$p = {{RT} \over {V - b}}$$ at T.

Here, b is the van der Waals constant. Which gas will exhibit steepest increase in the plot of Z (compression factor) vs p?

In the following reaction Rate of the reaction is the highest for :

The structures of beryllium chloride in the solid state and vapour, phase, respectively,are :

Which of the following potential energy (PE) diagrams represents the S_N1 reaction?