Three test tubes, A,B,C, contain Pb^(2+)...

Three test tubes, `A,B,C,` contain `Pb^(2+),Hg_(2)^(2+)` and `Ag^(+)` ( but unknown ) . To each aqueous solution, `NaOH` is added is excess . Following changes occur.
`A :` Black p p t, `B:` Brown ppt `, C :` White ppt but dssolves in excess of `NaOH`
`A,B` and `C` contain respectively.

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Three test tubes, `A,B,C,` contain `Pb^(2+),Hg_(2)^(2+)` and `Ag^(+)` ( but unknown ) . To each aqueous solution, `NaOH` is added is excess . Following changes occur. `A :` Black p p t, `B:` Brown ppt `, C :` White ppt but dssolves in excess of `NaOH` `A,B` and `C` contain respectively.

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Three test tubes, `A,B,C,` contain `Pb^(2+),Hg_(2)^(2+)` and `Ag^(+)` ( but unknown ) . To each aqueous solution, `NaOH` is added is excess . Following changes occur.
`A :` Black p p t, `B:` Brown ppt `, C :` White ppt but dssolves in excess of `NaOH`
`A,B` and `C` contain respectively.