Gas (B) gives brown ppt with `K_(2)HgI_(4)`
`rArr` gas (B) is `NH_(3)`
`rArr (A)` is `NH_(4)^(Theta)`
Gas (C ) turn water milky
`rArr (C )` can be `SO_(2)` or `CO_(2)`
Gas (D) is also obtain along with (C ) , gas (D) turn with blue flame and is fatal when inbaled
`rArr` gas (D) is `CO`
`rArr` gas (C ) is `CO_(2)`
`rArr (A)` has `C_(2)O_(4)^(2+)`
It is condiremed by the fact that `CaCI_(3)` gives ppt `CaC_(3)O_(4)(E )` which decolourises `MnO_(4)^(Theta) H^(Theta)`
`rArr (A)` is `(NH_(6))_(2)C_(2)O_(4)`
Explanation:
`underset((A))((NH_(4))_(2))C_(2)O_(4) overset(Delta)rarr underset((B))(2NH_(3)) + underset((C))(CO_(2)) + underset((D))(CO)+H_(2)O`
(B) is blue towards litmus (basic)
(C) is red towards litmus (acidic)
(D) is neutral
`(NH_(4))C_(2)O_(4) +2NaOH overset(Delta)rarr Na_(2)C_(2)O_(4) + underset((B))(2NH_(3)) + 2H_(2)O`
`Na_(2)C_(2)O_(4) +CaCI_(2) rarr underset("white ppt") (CaC_(2)O_(4)darr) +2NaCI`
`underset("Violet")(2MnO_(4)^(Theta)) 16 H^(o+) +5C_(2)O_(4)^(2-) rarr 10 CO_(2) +underset("Colourless")(2Mn^(2+)) +H_(2)O`
