MCQ
The given reaction $2NO + {O_2} \to 2N{O_2}$ is an example of
- AFirst order reaction
- BSecond order reaction
- ✓Third order reaction
- DNone of these
${\rm{Rate}} = {\rm{K[NO}}{{\rm{]}}^{\,\,{\rm{2}}}}{[{O_2}]^{\,1}}$
$\therefore $ O.R. $= 2 + 1 = 3$
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$A$. They exhibit high enthalpy of atomization as the d-subshell is full.
$B$. $\mathrm{Zn}$ and $\mathrm{Cd}$ do not show variable oxidation state while $\mathrm{Hg}$ shows $+\mathrm{I}$ and + $II.$
$C$. Compounds of $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are paramagnetic in nature.
$D$. $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are called soft metals.
Choose the most appropriate from the options given below:
