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When a colourless gas (A), which is pois...

When a colourless gas `(A),` which is poisonous and burns with blue flame, is passed through aqueous `NaOH` solution, gives a compound `(B)`. Compound `(B)` on heating gives `(C )`. `(C )` gives a white precipitate `(D)` with `CaCl_(2)`. Both `(C )` and `(D)` decolourises `KMnO_(4)`. Identify `(A)` to `(D)`.

Text Solution

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`underset("blue flame")underset("gas burns with")underset("Colourless,poisonous")((A))overset(+NaOH soln)(rarr)(B)`
(B) `overset(Delta)(rarr) (C )`
(C) `+CaCl_(2)rarr underset("White ppt".)((D))`
`(C )` and `(D)` decolourise `KMnO_(4)`, this indicates that both are reducing agents.
`(A)` is `CO`, i.e. carbon monoxide which burns with blue flame and is poisonous.
`underset((A))(CO)+NaOHrarrunderset((B))underset("Sodium formate")(HCOONa)`


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