Q.

The order of basic strength of ClO-ClO2-ClO3-,   ClO4- is       

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a

ClO4- >ClO2- >ClO->ClO3-

b

ClO->ClO2- >ClO3- >ClO4-

c

ClO->ClO4- >ClO3- >ClO2-

d

ClO4- >ClO3- >ClO2- >ClO-

answer is C.

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Detailed Solution

If the acid is strong its conjugate base is weak. Same like if the base is strong its conjugate acid is weak. Among the given option ClO4- is the conjugate base of strong acid  HClO4, therefore basic strength of ClO4- is weak. Among the given option ClO- is the conjugate base of weak acid    HClO, therefore basic strength of ClO- is strong.       

Hence the correct option is (C).    

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