Question

A brown coloured mixture of two gases is obtained by the reduction of 6N nitric acid with metallic copper. This mixture on cooling condenses to a blue liquid which on freezing $(-{30}^{o}C)$ gives a blue solid. The correct choice for blue liquid or solid is :

• A. it is referred to as the anhydride of nitrous acid.
• B. it is an acidic oxide and hence dissolves in alkalies producing nitrites.
• C. it can also be prepared by the action of 50% $HN{O}_3$ on arsenious oxide and then cooling to 250 K.
• D. all of the above

Answer 1

The correct option is D all of the above

$2Cu+6HN{O}_3\to 2Cu(N{O}_3{)}_2+NO+N{O}_2+3H_{2}O$

$NO+N{O}_2\stackrel{-{20}^{o}C}{\rightleftharpoons }{N}_2{O}_3\left(blue\right);$

(A) $2HN{O}_2\to N_2{O}_3+H_{2}O$

(B) $N_2{O}_3+2KOH\to 2KN{O}_2+H_{2}O$

(C) $2NH{O}_3+A{s}_2{O}_3+2H_{2}O\to \underset{\downarrow 250K}{\underset{}{NO+N{O}_2}}+2H_{3}As{O}_4$
$N_2{O}_3$

All options are correct.