Physical Chemistry MCQ with Answers

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:

Answer is:

68.4

Explanation:

For isotonic solution, w1⁄m1 = w2⁄m2

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

Answer is:

AlCl₃

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

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:

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:

Answer is:

Phenylacetic acid dimerizes in benzene

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