If latent heat of fusion of ice is 80 cal⁄gm at 0<sup>o</sup>C, calculate molal depression constant for water:

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116

Physical Chemistry MCQ with Answers

116) If latent heat of fusion of ice is 80 cal⁄gm at 0^oC, calculate molal depression constant for water:

18.63

186.3

1.863

0.1863

Answer is:

1.863

Explanation:

K_f = RT_f² ⁄ 1000l_v

Physical Chemistry MCQ with Answers

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117) Calculate the molal elevation constant of water that evaporates at 100^oC with the absorption of 536 cal⁄gm: (R = 2 cal)

0.519^oC

0.0519^oC

1.519^oC

2.519^oC

Answer is:

0.519^oC

Explanation:

K_b = RT_b² ⁄ 1000l_v

118) 15 gm of methyl alcohol is dissolved in 35 gm of water. What is the mass percentage of methyl alcohol in solution?

30%

50%

70%

75%

Answer is:

0.3

Explanation:

Mass percentage = (mass of methyl alcohol ⁄ mass of solution) x 100

119) Osmotic pressure of a sugar solution at 24^oC is 2.5 atm. Determine the concentration of the solution in gm mol⁄L:

0.0821 mol⁄L

1.082 mol⁄L

0.1025 mol⁄L

0.0827 mol⁄L

Answer is:

0.1025 mol⁄L

Explanation:

C = π⁄ST

120) 20 gm of a substance was dissolved in 500 mL of water and the osmotic pressure of the solution was found to be 600 mm of Hg at 15^oC. Determine the molecular weight of the substance:

1120

1198

1200

None of these

Answer is:

1198

Physical Chemistry MCQ with Answers

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116) If latent heat of fusion of ice is 80 cal⁄gm at 0oC, calculate molal depression constant for water:

1.863

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

117) Calculate the molal elevation constant of water that evaporates at 100oC with the absorption of 536 cal⁄gm: (R = 2 cal)

0.519oC

118) 15 gm of methyl alcohol is dissolved in 35 gm of water. What is the mass percentage of methyl alcohol in solution?

0.3

119) Osmotic pressure of a sugar solution at 24oC is 2.5 atm. Determine the concentration of the solution in gm mol⁄L:

0.1025 mol⁄L

120) 20 gm of a substance was dissolved in 500 mL of water and the osmotic pressure of the solution was found to be 600 mm of Hg at 15oC. Determine the molecular weight of the substance:

1198

Physical Chemistry MCQ with Answers

116) If latent heat of fusion of ice is 80 cal⁄gm at 0^oC, calculate molal depression constant for water:

117) Calculate the molal elevation constant of water that evaporates at 100^oC with the absorption of 536 cal⁄gm: (R = 2 cal)

0.519^oC

119) Osmotic pressure of a sugar solution at 24^oC is 2.5 atm. Determine the concentration of the solution in gm mol⁄L:

120) 20 gm of a substance was dissolved in 500 mL of water and the osmotic pressure of the solution was found to be 600 mm of Hg at 15^oC. Determine the molecular weight of the substance: