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Which of the comparison regarding Zn, Cd, Hg islare incorrect ?
(l) 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 $A_{2}^{2 +}$ type ion

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only III

I, III, IV

I and III

all of these

answer is B.

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Detailed Solution

ZnCl₂ , CdCl₂ , HgCl₂ all are covalent. Zn and Cd form white ppt. of Zn(OH)₂ and Cd(OH)₂ but Hg form HgO on adding NaOH. Zn(OH)₂ $↓$ further dissolves on adding excess NaOH.

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