0.01M solution of KCl nad BaCl2 are prepared in water. The freezing point of KCl is found to be −2oC. What is the freezing point of BaCl2 solution, assuming both to be completely ionized?

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140

Physical Chemistry MCQ with Answers

140) 0.01M solution of KCl nad BaCl₂ are prepared in water. The freezing point of KCl is found to be −2^oC. What is the freezing point of BaCl₂ solution, assuming both to be completely ionized?

−3^oC

+3^oC

−2^oC

−4^oC

Answer is:

−3^oC

Explanation:

ΔT_f ∝ i

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:

136.2

68.4

34.2

171.2

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:

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.

Physical Chemistry MCQ with Answers

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140) 0.01M solution of KCl nad BaCl2 are prepared in water. The freezing point of KCl is found to be −2oC. What is the freezing point of BaCl2 solution, assuming both to be completely ionized?

−3oC

Physical Chemistry MCQ with Answers

Related 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:

68.4

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

Physical Chemistry MCQ with Answers

140) 0.01M solution of KCl nad BaCl₂ are prepared in water. The freezing point of KCl is found to be −2^oC. What is the freezing point of BaCl₂ solution, assuming both to be completely ionized?

−3^oC

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

AlCl₃