A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B) which when passed through an alkaline solution of `K_(2) [HgI_(4)]` gave a brown precipitate. The substance (A) on heating gave a gasa (X) which rekindled a glowing splinter but does not give brown fumes with nitric oxide. The gas (X) is:

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)`