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Which of the comparison Zn, Cd, Hg is/ar...

Which of the comparison Zn, Cd, Hg is/are incorrect?
(I) `ZnCl_(2)` is ionic whereas ` CdCl_(2) and HgCl_(2)` is covalent
(II) Zn and Cd dissolves in dilute acid HCl liberating `H_(2)` but Hg can not
(III) Zn and cd forming with ppt. of `Zn(OH)_(2) and Cd(OH)_(2)` but Hg forms coloured ppt. of `Hg(OH)_(2)`.
(IV) All form `A_(2)^(2+)` type ion

A

Only III

B

I, III, IV

C

I and IV

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
B
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