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Question

Which of the comparison regarding Zn,Cd,Hg is/are correct?

(I) ZnCl2 is ionic whereas CdCl2 and HgCl2 are covalent.
(II) Zn and Cd dissolves in dilute acid (HCl) liberating H2 whereas Hg do not.
(III) Zn and Cd forms precipitate of Zn(OH)2 and Cd(OH)2 but Hg forms coloured precipitate of Hg(OH)2.
(IV) All forms A2+2 type ion.

A
Only III
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B
I, III and IV
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C
II and III
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D
All of these
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Solution

The correct option is B II and III
(I) Mercuric chloride is covalent in nature whereas zinc chloride and cadmium chloride are ionic in nature.
Thus, statement (I) is incorrect.
(II) Less electropositive mercury cannot displace hydrogen from acids. More electropoitive zinc and cadmium can displace hydrogen from acids.
Thus, statement (II) is correct.
(III) Mercury does not forms hydroxide or peroxide whereas zinc and cadmium forms hydroxide and peroxide.
Thus, statement (III) is correct.
(IV) Mercury forms Hg2+2 which is unique as no other ion exists as such.
Zinc and cadmium does not form A2+2 ion.
Thus, statement (IV) is incorrect.
Thus, only statements (II) and (III) are correct.

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