1.

An aqqeoussolution of a substance gives a white precipitate on tretment with diute hydrocloric acid which which dissolves on heating .When hydrogen sulphide ispassed through the hot acidic solution a black precipitateis obtained .The substanceis a

Answer»

`Hg_(2)^(2+)` SALT
`Cr^(+)` salt
`AG^(o+)` salt
`Pb^(2+)`salt

Solution :A whiteprecipitate which issolublein hot WATER is LEAD chloride
`Pb^(2+) + 2HCI rarrunderset(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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