An aqueous solution of a substance gives a white precipitate on treatment with dil $H C l$ , which dissolved on heating. On passing $H_{2} S$ in hot acidic solution a black precipitate is formed. The substance is:

H g_{2}^{2 +}

salt

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C u^{2 +}

salt

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A g^{+}

salt

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P b^{2 +}

salt

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Solution

The correct option is D $P b^{2 +}$ salt
$P b C l_{2}$ is soluble in hot water but insoluble in cold water.

$P b^{2 +} + 2 H C l △ ⟶ P b C l_{2} H_{2} S ⟶ P b S$

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An aqueous solution of a substance gives a white precipitate on treatment with dil HCl, which dissolved on heating. On passing H2S in hot acidic solution a black precipitate is formed. The substance is:

The correct option is D Pb2+ saltPbCl2 is soluble in hot water but insoluble in cold water. Pb2++2HCl△⟶PbCl2H2S⟶PbS

An aqueous solution of a substance gives a white precipitate on treatment with dil $H C l$ , which dissolved on heating. On passing $H_{2} S$ in hot acidic solution a black precipitate is formed. The substance is:

The correct option is D $P b^{2 +}$ salt
$P b C l_{2}$ is soluble in hot water but insoluble in cold water.

$P b^{2 +} + 2 H C l △ ⟶ P b C l_{2} H_{2} S ⟶ P b S$