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Q.

Among the following, relatively weak base is

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a

${Cl}^{-}$

b

$F^{-}$

c

${Br}^{-}$

d

$I^{-}$

answer is D.

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Detailed Solution

The weakest base, the base with the smallest base dissociation constant, K_b, will correspond to the strongest conjugate acid.

Weakest Base $\to$ Strongest conjugate acid

Conjugate Acidity to HI> HBr> HCl> HF

therefore, Weakest Base $I^{-}$ .

Hence, the correct option is option (D) $I^{-}$ .

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