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GS
GS Set-1
Chemistry
Physical Chemistry
129

Physical Chemistry MCQ with Answers

129) The vapour pressures of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour pressure in contant with equimolar solution of benzene and toluene is:

0.6

0.5

0.27

0.74

Answer is:

0.27

Physical Chemistry MCQ with Answers

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130) Van′t Hoff factor for a dilute solution of sodium argento cyanide is:

0.25

0.5

Answer is:

2

131) A solution obtained by dissolving 0.2 gm of solute in 100 cc of solution in benzene at 21^oC develops at a rise of 2 mm of Hg osmotic equilibrium. Find molarity of the solution: (Density of solution = 0.88 gm⁄cc)

8.3 x 10⁻³ mol⁄L

4.15 x 10⁻⁶ mol⁄L

8.3 x 10⁻⁴ mol⁄L

None of these

Answer is:

8.3 x 10⁻³ mol⁄L

132) When mercuric iodide is added to the aqueous solution of potassium iodide, the:

Freezing point is raised

Freezing point does not change

Freezing point is lowered

Boiling point does not change

Answer is:

Freezing point is raised

Explanation:

There is a decrease in number of ions present in the solution, so ΔT_f decreases.

133) The osmotic pressure of urea solution is 500 mm of Hg at 10^oC. If the solution is diluted and temperature is raised to 25^oC, the osmotic pressure decreases to 105.3 mm of Hg. What is the extent of dilution?

10 times

2.5 times

5 times

7.5 times

Answer is:

5 times

Physical Chemistry MCQ with Answers

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129) The vapour pressures of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour pressure in contant with equimolar solution of benzene and toluene is:

0.27

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

130) Van′t Hoff factor for a dilute solution of sodium argento cyanide is:

2

131) A solution obtained by dissolving 0.2 gm of solute in 100 cc of solution in benzene at 21oC develops at a rise of 2 mm of Hg osmotic equilibrium. Find molarity of the solution: (Density of solution = 0.88 gm⁄cc)

8.3 x 10−3 mol⁄L

132) When mercuric iodide is added to the aqueous solution of potassium iodide, the:

Freezing point is raised

133) The osmotic pressure of urea solution is 500 mm of Hg at 10oC. If the solution is diluted and temperature is raised to 25oC, the osmotic pressure decreases to 105.3 mm of Hg. What is the extent of dilution?

5 times

Physical Chemistry MCQ with Answers

131) A solution obtained by dissolving 0.2 gm of solute in 100 cc of solution in benzene at 21^oC develops at a rise of 2 mm of Hg osmotic equilibrium. Find molarity of the solution: (Density of solution = 0.88 gm⁄cc)

8.3 x 10⁻³ mol⁄L

133) The osmotic pressure of urea solution is 500 mm of Hg at 10^oC. If the solution is diluted and temperature is raised to 25^oC, the osmotic pressure decreases to 105.3 mm of Hg. What is the extent of dilution?