AIEEE 2013 PYQ Mock Test

The order of stability of the following carbocations:

Which of the following represents the correct order of increasing first ionization enthalpy for $\text{Ca}$, $\text{Ba}$, $\text{S}$, $\text{Se}$ and $\text{Ar}$?

For gaseous state, if most probable speed is denoted by $C^{\ast }$, average speed by $\bar{C}$ and root mean square speed by $C$, then for a large number of molecules the ratios of these speeds are:

The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was:

Consider the following reaction:
$$x{\text{MnO}}_4^{-}+y{\text{C}}_2{\text{O}}_4^{2-}+z{\text{H}}^{+}\to x{\text{Mn}}^{2+}+2y{\text{CO}}_2+\frac{z}{2}{\text{H}}_2\text{O}$$
The values of $x,y$ and $z$ in the reaction are, respectively: