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Carbonates and Bicarbonates

Substance X...

Question

Substance $X$ :
(I) reacts with $H_{2} S$ to produce white turbidity.
(II) changes light green solution of $F e S O_{4}$ into yellow colour.
(III) reacts with moisture to give pungent smelling gas.
Hence $X$ is:

K M n O_{4}

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K_{2} C r_{2} O_{7}

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S O_{2}

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C a O C l_{2}

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Solution

The correct option is D $C a O C l_{2}$
$C a O C l_{2} + H_{2} O \to C a (O H)_{2} + C l_{2} (Pungent smelling gas) ↑$
$H_{2} S + C l_{2} \to 2 H C l + S (White turbidity)$
$2 F e S O_{4} (Light green) + H_{2} S O_{4} + C l_{2} \to F e_{2} (S O_{4})_{3} + 2 H C l$

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