The correct order of the base strength of the given ions is

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${CN}^{-} > {NH}_{2}^{-} > {OH}^{-}$

${NH}_{2}^{-} > {CN}^{-} > {OH}^{-}$

${NH}_{2}^{-} > {OH}^{-} > {CN}^{-}$

${CN}^{-} > {OH}^{-} > {NH}_{2}^{-}$

answer is A.

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Detailed Solution

The order of the conjugate acid is $HCN > H_{2} O > {NH}_{3}$ . The conjugate base follows the reverse order, i.e. ${NH}_{2}^{-} > {OH}^{-} > {CN}^{-}$

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