Which of the comparison regarding Zn, Cd, Hg is/are incorrect ?
(I) ZnCl2 is ionic whereas CdCl2 and HgCl2 are covalent
(II) Zn and Cd dissolves in dilute acid (HCl) liberating H2 but Hg can not

Question

Which of the comparison regarding Zn, Cd, Hg is/are incorrect ?
(I) ZnCl2 is ionic whereas CdCl2 and HgCl2 are covalent
(II) Zn and Cd dissolves in dilute acid (HCl) liberating H2 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 A2^2+ type ion

Prashant Kotian · Accepted Answer

Correct answer: B

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