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GS
GS Set-1
Chemistry
Physical Chemistry
149

Physical Chemistry MCQ with Answers

149) The freezing point 1m NaCl solution assuming NaCl to be 100% dissociated in water is:

−1.86^oC

−3.72^oC

+1.86^oC

+3.72^oC

Answer is:

−3.72^oC

Explanation:

ΔT_f = iK_fm

Physical Chemistry MCQ with Answers

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150) Which has the highest freezing point?

1m K₄[Fe(CN)₆] solution

1m glucose solution

1m KCl solution

1m rock salt solution

Answer is:

1m glucose solution

Explanation:

A substance which in the aqueous solution, furnishes the minimum number of particles will lower the freezing point to the minimum. Therefore, this solution will have the maximum freezing point.

151) The density (in gm⁄mL) of a 3.6M sulphuric acid solution that is 29% H₂SO₄ by mass will be:

1.45

1.64

1.88

1.22

Answer is:

1.22

152) If the amount of a nonelectrolyte dissolved is doubled, but that of solvent is quadrupled, the elevation in the boiling point of the solution will be:

Doubled

Halved

Quadrupled

Unchanged

Answer is:

Halved

Explanation:

If the amount of a nonelectrolyte dissolved is doubled, but that of solvent is quadrupled, the elevation in the boiling point of the solution will be Halved.

153) The molal boiling point constant for water is 0.51^oC kg⁄mol. When 0.1 mol of sugar is dissolved in 200 gm of water, the solution boils under a pressure of 1 atm at

100.513^oC

100.0513^oC

100.255^oC

101.025^oC

Answer is:

100.255^oC

Explanation:

ΔT_b = K_bm

Physical Chemistry MCQ with Answers

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149) The freezing point 1m NaCl solution assuming NaCl to be 100% dissociated in water is:

−3.72oC

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

150) Which has the highest freezing point?

1m glucose solution

151) The density (in gm⁄mL) of a 3.6M sulphuric acid solution that is 29% H2SO4 by mass will be:

1.22

152) If the amount of a nonelectrolyte dissolved is doubled, but that of solvent is quadrupled, the elevation in the boiling point of the solution will be:

Halved

153) The molal boiling point constant for water is 0.51oC kg⁄mol. When 0.1 mol of sugar is dissolved in 200 gm of water, the solution boils under a pressure of 1 atm at

100.255oC

Physical Chemistry MCQ with Answers

−3.72^oC

151) The density (in gm⁄mL) of a 3.6M sulphuric acid solution that is 29% H₂SO₄ by mass will be:

153) The molal boiling point constant for water is 0.51^oC kg⁄mol. When 0.1 mol of sugar is dissolved in 200 gm of water, the solution boils under a pressure of 1 atm at

100.255^oC