MCQ
Extra pure $N_2$ can be obtained by heating :-
- A$NH_4NO_2$
- B$(NH_4)_2Cr_2O_7$
- ✓$Ba(N_3)_2$
- D$NH_3$ with $CuO$
$2 \mathrm{NaN}_{3} \stackrel{573 \mathrm{K}}{\longrightarrow} 2 \mathrm{Na}+3 \mathrm{N}_{2}$
Azide salt of barium can be obtained in the purest form as well as the decomposition product contains solid Ba as a by-product along with gaseous nitrogen, hence no additional step of
separation is required.
$\mathrm{Ba}\left(\mathrm{N}_{3}\right)_{2} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Ba}+3 \mathrm{N}_{2}$
Hence, option $\mathrm{C}$ is correct.
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Reason : Oxidation state of $Cl$ in $HClO_4$ is $+VII$ and in $HClO_3$ $+V$.
| List $-I$ (Chemicals) | List $-II$ (Use / Preparation / Constituent) |
| $(a)$ Alcoholic potassium hydroxide | $(i)$ Electrodes in batteries |
| $(b)$ $Pd / BaSO _{4}$ | $(ii)$ Obtained by addition reaction |
| $(c)$ $BHC$ (Benzene hexachloride) | $(iii)$ Used for $\beta$ - elimination reaction |
| $(d)$ Polyacetylene | $(iv)$ Lindlar's catalyst |
Choose the most appropriate match
$A, B$ and $C$ are