Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

221) 1 L of saturated solution of MgCl₂ is evaporated to dryness, due to which 20 mg of residue is left. What is the solubility product of MgCl₂ of that solution?

Answer is:

3.39 x 10⁻¹¹

222) 10 mL of 0.2M acid is added to 250 mL of a buffer solution with pH = 6.34. The pH of the solution becomes 6.32. The buffer capacity of the solution is:

Answer is:

0.1

Explanation:

Buffer capacity = [H⁺] ⁄ change in pH

223) Heat of neutralisation when 200 mL of 0.1M HCl is mixed with 300 mL of 0.2M NaOH will be:

Answer is:

−1.142 kJ

Explanation:

Limiting reagent = HCl

224) To 100 mL of 2M aniline, 100 mL of 2M HCl solution is added. pH of the final solution at 25^oC is:

Answer is:

4.5

Explanation:

pH = 7 − 0.5pK_b − 0.5log C

225) If 50 mL of 0.2M NaCN is mixed with 50 mL of 0.2M HCl then:

Answer is:

[H₃O⁺] = [CN⁻] = 7 x 10⁻⁶

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