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Black (A)+H(2)SO(4)to (B)"gas"+( C) (B...

Black `(A)+H_(2)SO_(4)to (B)"gas"+( C)`
`(B)+(CH_(3)COO)_(2) Pb to (D)` black ppt.
`( C)+K_(3)[Fe(CN)_(6)] to (E)` blue.
`( C)` also decolourilses acidified `KMnO_(4)`.Identify `(A)` to `(E)`

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`FeS+H_(2)SO_(4) to H_(2)S +FeSO_(4)`
`H_(2)S +(CH_(3)COO)_(2)Pb to PbS("black ppt.")+2CH_(3)COOH`
`Fe^(2+) + K_(3)[Fe(CN)_(6)]^(3-) to KFe^(II)[Fe^(III)(CN)_(6)]`Turnbull's blue.
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An organic compound (A) (C_(5)H_(7)OCl) reacts rapidly with ethanol to give (B) (C_(7)H_(12)O_(2)) . (A) also reacts with water to produce an acid which reacts with bromine to give (C ) (C_(5)H_(8)Br_(2)O_(2)) . (B) on boiling with H_(2)SO_(4) forms an acid (D). When (D) is oxidised with KMnO_(4) an acid (E ) (C_(4)H_(6)O_(3)) is produced. On mild heating, (E ) gives (F) (C_(3)H_(6)O) which cannot be oxidised by ammoniacal AgNO_(3) . Identify the compounds (A) to (F).

X_(2)S_(n)+water to X(OH)_(n) darr+ underset((Gas))(Y uarr)overset(Pb(CH_(3)COO)_(2))tounderset(("Black ppt."))(Z darr) Then (X) cation can not be:

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