Pure benzene freezes at 5.3oC. A solution of 0.223 gm of phenylacetic acid in 4.4 gm of benzene (Kf = 5.12 K kg⁄mol) freezes at 4.47oC. From this observation, one can conclude that:

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145

Physical Chemistry MCQ with Answers

145) Pure benzene freezes at 5.3^oC. A solution of 0.223 gm of phenylacetic acid in 4.4 gm of benzene (K_f = 5.12 K kg⁄mol) freezes at 4.47^oC. From this observation, one can conclude that:

Phenylacetic acid exists as such in benzene

Phenylacetic acid undergoes partial ionization in benzene

Phenylacetic acid undergoes complete ionization in benzene

Phenylacetic acid dimerizes in benzene

Answer is:

Phenylacetic acid dimerizes in benzene

Physical Chemistry MCQ with Answers

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146) Human blood has an osmotic pressure of 7.65 atm at body temperature. Hence, molarity of an intravenous glucose solution to have same osmotic pressure, will be:

0.3M

0.1M

0.5M

0.2M

Answer is:

0.3M

Explanation:

πV = nRT

147) A supersaturated solution is a metastable state of solution in which solute concentration:

Is equal to the solubility of that substance in water

Exceeds its solubility

Less than its solubility

Continuously changes

Answer is:

Exceeds its solubility

148) If an aqueous solution of glucose is allowed to freeze, then crystals of which will separate out first?

Glucose

Water

Both of these

None of these

Answer is:

Water

Explanation:

As the solute is solid, then solvent (water) will freeze out.

149) The freezing point 1m NaCl solution assuming NaCl to be 100% dissociated in water is:

−1.86^oC

−3.72^oC

+1.86^oC

+3.72^oC

Answer is:

−3.72^oC

Explanation:

ΔT_f = iK_fm

Physical Chemistry MCQ with Answers

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145) Pure benzene freezes at 5.3oC. A solution of 0.223 gm of phenylacetic acid in 4.4 gm of benzene (Kf = 5.12 K kg⁄mol) freezes at 4.47oC. From this observation, one can conclude that:

Phenylacetic acid dimerizes in benzene

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

146) Human blood has an osmotic pressure of 7.65 atm at body temperature. Hence, molarity of an intravenous glucose solution to have same osmotic pressure, will be:

0.3M

147) A supersaturated solution is a metastable state of solution in which solute concentration:

Exceeds its solubility

148) If an aqueous solution of glucose is allowed to freeze, then crystals of which will separate out first?

Water

149) The freezing point 1m NaCl solution assuming NaCl to be 100% dissociated in water is:

−3.72oC

Physical Chemistry MCQ with Answers

145) Pure benzene freezes at 5.3^oC. A solution of 0.223 gm of phenylacetic acid in 4.4 gm of benzene (K_f = 5.12 K kg⁄mol) freezes at 4.47^oC. From this observation, one can conclude that:

−3.72^oC