Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

261) Mass of H₂C₂O₄ required to reduce 100 mL of 0.008M KMnO₄ in acidix medium is x gm and to neutralize 100 mL of 0.01M Mg(OH)₂ is y gm, then the relation between x and y is:

Answer is:

x = y

262) The pH of 0.1M solution of the following, increases in the order:

Answer is:

HCl < NH₄Cl < NaCl < NaCN

263) What is [H⁺] in mol⁄L of a solution that is 0.2M in CH₃COONa and 0.1M in CH₃COOH? K_a for CH₃COOH = 1.8 x 10⁻⁵

Answer is:

9 x 10⁻⁶

264) In a buffer solution containing equal concentration of B⁻ and HB, the K_b for B⁻ is 10⁻¹⁰. The pH of buffer solution is:

Answer is:

4

Explanation:

pOH = pK_b + log ([B⁻]⁄[HB])

265) Equal volumes of two solutions of NaOH, one having pH = 11 and the other having pH = 12, are mixed together. pH of the resultant solution will be:

Answer is:

11.74

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