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Objective Questions
GS
GS Set-1
Chemistry
Physical Chemistry
235

Physical Chemistry MCQ with Answers

235) On dilution of a solution formed from CH₃COONH₄ and CH₃COOH:

pH decreases

pH increases

pH remains unchanged

None of the above

Answer is:

pH remains unchanged

Explanation:

Because it is an amphi-resistant solution.

Physical Chemistry MCQ with Answers

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Related Physical Chemistry MCQ with Answers

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

Phenolphthalein

Methyl orange

Phenol red

Litmus

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?

2⁄3

2.9

1⁄3

2.9⁄4.7

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?

3.75

4.75

5.75

10

Answer is:

5.75

Explanation:

pH = pK_a + log([salt]⁄[acid])

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

Pink

Red

No colour

Violet

Answer is:

No colour

Explanation:

Colourless in acidic medium because concentration of pH is low.

Physical Chemistry MCQ with Answers

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