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Q.

Identify the correct statements from the following
I) Au is soluble in aqua regia but not Pt
II) Among the oxoacids of chlorine highest oxidation state possible for chlorine is +7
III) Among the hydrogen halides lowest boiling point is for HCl
IV) The order of stability of oxides of halogens is Cl>Br>I

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a

I & II only

b

II & III only

c

I & IV only

d

II & IV only

answer is B.

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Detailed Solution

HClO₄ is the oxoacid of chlorine in which Cl present in its highest oxidation state, +7
Boiling point Predominantly depends on the Van der waal forces. More is the molecular mass, more is the boiling point. As molecular mass of HCl is low, hence has the least boiling point.

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