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The correct decreasing order of basic strength of the following species is ________ $H_{2} O, {NH}_{3}, {OH}^{-}, {NH}_{2}^{-}$

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${NH}_{3} > H_{2} O > {NH}_{2}^{-} > {OH}^{-}$

${OH}^{-} > {NH}_{2}^{-} > H_{2} O > {NH}_{3}$

$H_{2} O > {NH}_{3} > {OH}^{-} > {NH}_{2}^{-}$

${NH}_{2}^{-} > {OH}^{-} > {NH}_{3} > H_{2} O$

answer is A.

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Detailed Solution

Weaker the acid stronger the base. Ammonia is very weak acid, hence its conjugate base is very strong.

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