Analytical ChemistryHard
Question
In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are soluble in excess KI solution ?
Options
A.HgI2, Hg2I2
B.HgI2, BiI3
C.Cu2I2, AgI
D.CdI2, PbI2
Solution
HgI2 ↓ (red) + 2I- → [HgI4]2- (soluble colourless complex) ; BiI3 ↓ (black) + I- → [BiI4]- (soluble orange complex).
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