`NaNO_(3)` on heating with sodium hydroxide solution and zind liberatres a gas which is also obtained by `:`

Options

A. heating `NH_(4)NO_(3)`
B. heating `NH_(4)NO_(2)` with sodium hydroxide solution.
C. heating `(NH_(4))_(2)Cr_(2)O_(7)`
D. heating `Ca(NO_(3))_(2)`.

Answer

2

Explanation

`NaNO_(3)+8[H]overset(Zn//NaOH)rarr NaOH+2H_(2)O+NH_(3)`
`(1) NH_(4)NO_(3)overset(Delta)rarrN_(2)O+2H_(2)O`
`(2)NH_(4)NO_(2)+NaOH overset(Delta)rarrNaNO_(2)+NH_(3)+H_(2)O`
`(3)(NH_(4))_(2)Cr_(2)O_(7)overset(Delta)rarrN_(2)+Cr_(2)O_(3)+4H_(2)O`
`(4)2Ca(NO_(3))_(2)overset(Delta)rarr2CaO+4NO_(2)+O_(2)`