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CGP EDU Academic Team
Published on: August 13, 2026
A solution of a metal ion when treated with K Ι gives a red precipitate which dissolves in excess K Ι to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is :
Text Solution
Verified by ExpertsThe correct answer is:
B
Hg 2+ + 2I – 
HgI 2 ↓ (scarlet / red)
HgI 2 + 2I – (excess) 
[HgI 4 ] 2– (soluble complex)
Hg 2+ + Co(SCN) 2 
Co[Hg(SCN) 4 ] ↓ (deep blue)
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