MCQ
Aniline when treated with $HN{O_2}$ and $HCl$ at ${0\,^o}C$ gives
- APhenol
- BNitrobenzene
- ✓A diazo compound
- DNone of these

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$(a)$ ${CrO}_{3}$ $(b)$ ${Fe}_{2} {O}_{3}$ $(c)$ ${MnO}_{2}$ $(d)$ ${V}_{2} {O}_{5}$ $(e)$ ${Cu}_{2} {O}$
If $\mathop H\limits^ \oplus $ ion concentration is doubled, electrode potential of the half cell will