which of the following compounds does not yield `NH_(3)`on heating?

Options

A. `NH_(4)Cl`
B. `(NH_(4))_(2)CO_(3)`
C. `(NH_(4))_(2)SO_(4)`
D. `NH_(4)NO_(2)`

Answer

4

Explanation

Ammonia salts decompose quite readily on heating.if the anion is not particularly oxidizing (e.g.`Cl^(-)CO_(3)^(2-) or SO_(4)^(2-)`) then ammonia is evolved:
`NH_(4)Cloverset(Delta)rarrNH_(3)+HCl`
`(NH_(4))_(2)CO_(3)overset(Delta)rarrNH_(3)+H_(2)CO_(3)`
`(NH_(4))_(2)SO_(4)overset(Delta)rarr2NH_(3)+H_(2)SO_(4)`
if the anion is more oxidizing (e.g.`NO_(2)^(-),NO_(3)^(-),N_(3)^(-),ClO_(4)^(-),Cr_(2)O_(7)^(2-)`) then `NH_(4)^(+)`is oxidized to `N_(2)` or `N_(2)O`.
`NH_(4)NO_(2)overset("heat")rarrN_(2)+2H_(2)O`
`NH_(4)NO_(3)rarrN_(2)O+2H_(2)O`
`(NH_(4))_(2)Cr_(2)O_(7)rarrN_(2)+4H_(2)O+Cr_(2)O_(7)`
`2NaN_(3)rarr3N_(2)+2Na`