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Carbon Monoxide

A white powde...

Question

A white powder $A$ on heating gave a non-combustible gas and a white residue. The residue on heating turns yellow. The residue dissolves in dil. $H C l$ and the solution gives a white ppt with $K_{4} [F e (C N)_{6}]$ . $A$ would be:

A

C a C O_{3}

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B

Z n C O_{3}

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C

C a S O_{3}

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D

C u C O_{3}

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Solution

The correct option is B $Z n C O_{3}$
$Z n C O_{3}$ on heating decomposes into $Z n O$ and $C O_{2}$ .
$Z n O$ on reaction with dilute $H C l$ forms $Z n C l_{2}$ .
$2 Z n C l_{2} + K_{4} [F e (C N)_{6}] ⟶ Z n_{2} [F e (C N)_{6}] ↓ ↓$
$W h i t e P p t .$
It is a potassium ferrocyanide test.

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