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 (-30o 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% HNO3 on arsenious oxide and then cooling to 250K.
(D) All of these.
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