Question

A brown coloured mixture of two gases is obtained by the reduction of 6N nitric acid with metallic copper. The mixture on cooling condenses to a blue liquid which on freezing `(-30^@ 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% `HNO_3` on arsenious oxide and then cooling to 250 K
D. All of these

Answer 1

Correct Answer - D
`2Cu+6HNO_3 to 2Cu(NO_3)_2 + NO +NO_2 +3H_2O`
`NO+NO_2 overset(-20^@C)hArr N_2O_3 ("blue"), (A) 2HNO_2 to N_2O_3 +H_2O`
(B)`N_2O_2+2KOH to 2KNO_2 + H_2O`
(C )`2NHO_3 + As_2O_3 + 2H_2O to`

All options are correct.