In which of the following pairs the prec...

In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are soluble in excess `Kl` solution?

A

`Hgl_(2),Hg_(2)l_(2)`

B

`Hgl_(2),Bil_(3)`

C

`Cu_(2)l_(2),Agl`

D

`Cdl_(2),Pbl_(2)`

Verified by Experts

The correct Answer is:

B

`Hgl_(2)darr("red")+2l^(-)to[Hgl_(4)]^(2-)("soluble colourless complex"),Bil_(3)darr("black")+l^(-)to[Bil_(4)]^(-)`(soluble orange complex)

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