STANDARD Chemistry Acid-Base Strength MCQ Question with Solution

The correct decreasing order of basic strength of the following species is ________. H₂O, NH₃, OH⁻, NH₂⁻

A

NH₂⁻ > OH⁻ > NH₃ > H₂O

B

OH⁻ > NH₂⁻ > H₂O > NH₃

C

NH₃ > H₂O > NH₂⁻ > OH⁻

D

H₂O > NH₃ > OH⁻ > NH₂⁻

Correct Answer

Option A

Detailed Explanation

NH₃ is more basic than H₂O, therefore NH₂⁻ (conjugate base of weak acid NH₃) is a stronger base than OH⁻. Thus, decreasing order of basic strength is NH₂⁻ > OH⁻ > NH₃ > H₂O.

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