Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

236) Which of the following indicators is appropriate in the titration of NH₄OH and strong acid?

Answer is:

Methyl orange

237) What will be the mole fraction of acetone in the solution formed by 1.8 gm of water and 2.9 gm of acetone?

Answer is:

1⁄3

238) Value of pK_a for acetic acid at 25^oC is 4.75. What will be the pH value of the solution in which ratio of concentration of sodium acetate and acetic acid is 10?

Answer is:

5.75

Explanation:

pH = pK_a + log([salt]⁄[acid])

239) Phenolphthalein gives which of the following colours in acidic medium?

Answer is:

No colour

Explanation:

Colourless in acidic medium because concentration of pH is low.

240) If pK_{a_{of acetic acid at 25^oC is 4.75, then determine the pH of that solution in which 0.02M sodium acetate and acetic acid are present:}}

Answer is:

4.75

Explanation:

[salt] = [acid]

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