Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

226) What will be the value of K_w at 90^oC, if [H⁺] in pure water is 10⁻⁶ gram ion⁄L?

Answer is:

10⁻¹²

Explanation:

K_w = [H⁺][OH⁻]

227) Concentration of [H⁺] will decrease on mixing which of the following salts with the solution of acetic acid?

Answer is:

KCN

Explanation:

Solution of KCN is basic. Therefore, concentration of [H⁺] will decrease on mixing it with acetic acid and thus pH will increase.

228) Which of the following is true for aqueous solution of CH₃NH₂ of 0.1M concentration?

Answer is:

pH > 7

Explanation:

CH₃NH₂ is basic.

229) If pH of 0.1M acetic acid is 3, then dissociation constant of this acid will be:

Answer is:

10⁻⁵

Explanation:

K_a = Cx²

230) Solution of which of the following will have maximum pH value?

Answer is:

Na₂CO₃

Explanation:

Na₂CO₃ is the most basic.

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