A mixture of two salt was treated as follows :
i. The mixture was heated with magnanese dioxide and concentrated sulphuric acid , when a yellowish -green gas was liberated.
ii. The mixture on heating with sodium hydroxide solution gave a gas which turned red litmus blue
iii. Its solution in water gave a blue precipitate with potassium ferricyanide and red colourtion with ammonium thiocynate
iv. The mixture was boiled with potassium hydroxide and the librated gas was bubbled through an alkline solution of `K_(2)HgI_(4)` to give a brown precipitate identify the two salts gives ionic equation for the reaction involved in the tests (i) , (ii) and (iii).

Options

A. `NH_(3)`
B. `O_(2)`
C. `O_(3)`
D. `N_(2)O`

Answer

D

Explanation

The white crystalline solid (A) is`NH_(4)NO_(3)`
`underset((A))(NH_(4)NO_(3))rarrNaNO_(3)+underset((B))(NH_(3))+H_(2)O`
`underset((B))(NH_(3))+3KOH+2K_(2)[HgI_(4)]rarr H_(2)N-underset(("Brown ppt"))(Hg-O)-Hg-I+7KI+2H_(2)O`
`NH_(4)NO_(3)overset(Delta)rarrunderset(("x"))(N_(2)O)+2H_(2)O`
`C+2N_(2)O rarr CO_(2)+2N_(2)`