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Q.

An aqueous solution of a substance on treatment with dilute HCl, gives a white precipitate soluble in hot water. When $H_{2} S$ is passed through the hot solution of the salt in dil HCl, a black precipitate is formed. The salt is

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a

${Pb}_{}^{2 +} salt$

b

${Hg}_{2}^{2 +} salt$

c

${Cu}_{}^{2 +} salt$

d

${Ag}_{}^{+} salt$

answer is D.

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Detailed Solution

${Pb}^{2 +} in dilute HCl form {PbCl}_{2} (White ppt.)$

${Pb}^{2 +} {inH}_{2} S in presence of dilHCl gives PbS (Black ppt.)$

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