Q.

Strongest conjugate base is

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a

ClO−

b

ClO2−

c

ClO3−

d

ClO4−

answer is A.

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Detailed Solution

If acid is weak, its conjugate base will be strong. Greater the oxidation number of Cl, stronger the acid and thus, weaker the conjugate base.HClO+1,HClO2+3,HClO3′+5HClO4+7                                          →Oxidation number of Cl and acidic strength increases.ClO−,ClO2−,ClO3−,ClO4− ←Conjugate base strength increases.Hence, CIO- is the strongest base.
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