An aqqeous solution of a substance gives a white precipitate on tretment with diute hydrocloric acid which which dissolves on heating .When hydrogen sulphide is passed through the hot acidic solution a black precipitate is obtained .The substance is aA. `Hg_(2)^(2+)` saltB. `Cr^(+)` saltC. `Ag^(o+)` saltD. `Pb^(2+)`salt

An aqqeous solution of a substance gives a white precipitate on tretme

1.	An aqqeous solution of a substance gives a white precipitate on tretment with diute hydrocloric acid which which dissolves on heating .When hydrogen sulphide is passed through the hot acidic solution a black precipitate is obtained .The substance is aA. `Hg_(2)^(2+)` saltB. `Cr^(+)` saltC. `Ag^(o+)` saltD. `Pb^(2+)`salt
Answer» Correct Answer - d A white precipitate which is soluble in hot water is lead chloride `Pb^(2+) + 2HCI rarr underset(white)(PbCI_(2) darr ) + 2H^(oplus)` `underset(Hot solution)(PbCI_(2))+H_(2)S overset(H^(o+))rarr overset(White)underset(Black)(PbSdarr) +2HCI`

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