1.

Compounds (C ) and (D) respectively are :

Answer»

`AgNO_3 and Hg(NO_3)_2`
`AgNO_3 and Cu(NO_3)_2`
`Pb(NO_3)_2 and Bi(NO_3)_3`
`AgNO_3 and Bi(NO_3)_3`

Solution :`Pb^(2+)+2I^(-)toPbI_2 darr ` (YELLOW), INSOLUBLE in `NH_3` solution.
`PbI_2 + 2I^(-)to [PbI_4]^(2-)`(soluble complex)
`PbI_2` is moderately soluble in boiling WATER giving a colourless solution.
`Bi^(2+)+3I^(-)to BiI_3 darr` (black) , `BiI_3 darr+I^(-) to [BiI_4]^(-)` (soluble complex)


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