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STANDARD Chemistry pH and pOH MCQ Question

Type: MCQ-conceptual-Medium-Class 12

Arrange the following solutions in the decreasing order of pOH: (A) 0.1 M HCl (B) 0.01 M NaOH (C) 0.01 M CH₃COONa (D) 0.01 M NaCl

A

(A) > (C) > (D) > (B)

B

(A) > (D) > (C) > (B)

C

(B) > (C) > (D) > (A)

D

(B) > (D) > (C) > (A)

Correct Answer

Option B

Detailed Explanation

For 0.1 M HCl, [H⁺] = 10⁻², pH = 2, pOH = 12. For 0.01 M NaOH, [OH⁻] = 10⁻², pOH = 2. CH₃COONa is a salt of weak acid and strong base, pH > 7, pOH < 7. NaCl is neutral, pH = 7, pOH = 7. Therefore, decreasing order of pOH is A > D > C > B.

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