In aqueous solution, which of the following orders regarding base strength is correct?

In aqueous solution, which of the following orders regarding base strength is correct?

A
${CH}_{3} {COO}^{-} < {HS}^{-} < {NH}_{3} < {CO}_{3}^{2 -}$
B
${CH}_{3} {COO}^{-} > {HS}^{-} > {NH}_{3} > {CO}_{3}^{2 -}$
C
${CH}_{3} {COO}^{-} > {HS}^{-} < {NH}_{3} < {CO}_{3}^{2 -}$
D
${CH}_{3} {COO}^{-} > {HS}^{-} > {CO}_{3}^{2 -} > {NH}_{3}$

Solution:

Weaker the acid, stronger the conjugate base. The order of acid strength is ${CH}_{3} COOH > H_{2} S > {NH}_{4}^{+} > {HCO}_{3}^{-}$ . Hence, the conjugate base follows the reverse order.

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