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A white powder (A) on heating gave a non...

A white powder (A) on heating gave a non-combustible gas and a residue (B). The white compound A on reaction with `H_(2)S` in alkaline medium forms a precipitate (C ) which dissolves in dil. `CH_(3)COOH`. (B) can be disssolved in dil HCl to prepare a solution which gives a white precipitate with `K_(4)[Fe(CN)_(6)]`.
Compuound B is

A

`CaO`

B

`CuO`

C

`CoO`

D

`ZnO`

Text Solution

Verified by Experts

The correct Answer is:
D
`ZnCO_(3)overset(Delta)(rarr)underset((B))(ZnO)+CO_(2)`
yellow when hot but white when cold
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