Aqueous sodium hydroxide is added to solid X and the mixture is heated.
A green precipitate is formed and an alkaline gas is given off.
Which ions are present in X?
$NH_4^ + $ and $F{e^{2 + }}$
2 )
$NH_4^ + $ and $F{e^{3 + }}$
3 )
$O{H^--}$ and $F{e^{2 + }}$
4 )
$O{H^--}$ and $F{e^{3 + }}$
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