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GS
GS Set-1
Chemistry
Physical Chemistry
141

Physical Chemistry MCQ with Answers

141) A 5% solution of sugarcane (mass = 342) is isotonic with 1% solution of X under similar conditions. The molecular weight of X is:

136.2

68.4

34.2

171.2

Answer is:

68.4

Explanation:

For isotonic solution, w1⁄m1 = w2⁄m2

Physical Chemistry MCQ with Answers

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142) Which one of the following is the most effective in causing the coagulation of an As₂S₃ solution:

KCl

AlCl₃

MgSO₄

K₃Fe(CN)₆

Answer is:

AlCl₃

143) The use of anhydrous common salts is to clear snow on the roads. This causes:

A lowering in freezing point of water

A lowering in melting point of ice

Ice melts at the temperature of the atmosphere present at that time

All of the above

Answer is:

All of the above

Explanation:

Addition of salt lowers the freezing point of water and thus, snow melts.

144) If a thin slice of suger beet is placed in concentrated solution of NaCl, then:

Sugar beet will lose water from its cells

Sugar beet will absorb water from solution

Sugar beet will neither absorb nor lose water

Sugar beet will dissolve in solution

Answer is:

Sugar beet will lose water from its cells

Explanation:

Osmosis occurs from dilute solutions to concentrated solutions, i.e. exo−osmosis.

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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141) A 5% solution of sugarcane (mass = 342) is isotonic with 1% solution of X under similar conditions. The molecular weight of X is:

68.4

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

142) Which one of the following is the most effective in causing the coagulation of an As2S3 solution:

AlCl3

143) The use of anhydrous common salts is to clear snow on the roads. This causes:

All of the above

144) If a thin slice of suger beet is placed in concentrated solution of NaCl, then:

Sugar beet will lose water from its cells

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

142) Which one of the following is the most effective in causing the coagulation of an As₂S₃ solution:

AlCl₃

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: