MCQ
Chlorine dioxide is best prepared by passing dry
- AChlorine gas over hot $HgO$
- BChlorine and oxygen gas over hot pt catalyst
- CHydrogen chloride and oxygen over silver oxide
- ✓Chlorine over hot silver chlorate
Reaction: $2 AgClO _3+\underset{\text { (Dry) }}{ Cl _2} \rightarrow 2 AgCl +2 ClO _2+ O _2$
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$I$ . $Zn +$ conc. $HNO_3$ (hot) $\to Zn(NO_3)_2 + X + H_2O$
$II$. $Zn +$ dil. $HNO_3$ (cold) $\to Zn(NO_3)_2 + Y + H_2O$
Compounds $X$ and $Y$ are respectively
