1.

Compounds (A) and (B) respectively are :A. `Cu(NO_3)_2 and pb(NO_3)_2`B. `Cu(NO_3)_2 and Hg(NO_3)_2`C. `Cu(NO_3)_2 and AgNO_3`D. `Hg(NO_3)_2 and AgNO_3`

Answer» Correct Answer - B
`2Cu^(2+)+5I^(-)toCu_2I_2darr`(white)+`I_3^(-)` (brown solution due to dissolution of `I_2`)
`Hg^(2+)+2I^(-)toHgI_2dar (red) , HgI_2 darr +2I^(-)to [HgI_4]^(2-)` (soluble complex)


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