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Solutions

Multiple Choice Questions

1.

18 g glucose (C6H12O6 ) is added to 178.2 g water. The vapor pressure of water (in torr) for this aqueous solution is:

• 76.0

• 752.4

• 759.0

• 759.0

422 Views

2.

The vapour pressure of acetone at 20oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20oC, its vapour pressure was 183 torr. The molar mass (g mol-1 ) of the substance is:

• 32

• 64

• 128

• 128

514 Views

3.

3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is:

• 18 mg

• 36 mg

• 42 mg

• 42 mg

424 Views

4.

For the estimation of nitrogen 1.4g of an organic compound was digested by Kjeldahl's method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M/10 sodium hydroxide for complete neutralisation. The percentage of nitrogen in the compound is

• 6%

• 10%

• 3%

• 3%

386 Views

5.

Consider separate solution of 0.500 M C2H5OH (aq), 0.100 M Mg3(PO4)2 (aq) 0.250 M KBr (aq) and 0.125 M Na3PO4 (aq) at 25oC. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

• They all have the same osmotic pressure

• 0.100 M Mg3(PO4)2 (aq) has the highest osmotic pressure

• 0.125 M Na3PO (aq) has the highest osmotic pressure

• 0.125 M Na3PO (aq) has the highest osmotic pressure

960 Views

6.

The ratio of masses of oxygen and nitrogen of a particular gaseous mixture is 1:4. The ratio of number of their molecule is

• 1:4

• 7:32

• 1:8

• 1:8

231 Views

7.

The molarity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2(M) HCl will be

• 0.875 M

• 1.00 M

• 1.75 M

• 1.75 M

215 Views

8.

The density of a solution prepared by dissolving 120 g of urea (mol. Mass = 60 u ) in 1000g of water is 1.15 g/mL. The molarity of this solution is

• 0.50 M

• 1.78 M

• 1.02 M

• 1.02 M

283 Views

9.

Kf for water is 1.86K kg mol–1.If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C2H6O2) must you add to get the freezing point of the solution lowered to –2.8°C?

• 72 g

• 93 g

• 39 g

• 39 g

314 Views

10.

A 5.2 molal aqueous solution of methyl alcohol, CH3OH, is supplied. What is the mole fraction of methyl alcohol in the solution?

• 0.100

• 0.190

• 0.086

• 0.086

596 Views