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

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

• 32

• 64

• 128

• 128

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

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%

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 25^oC. 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 Na₃P_O (aq) has the highest osmotic pressure

• 0.125 M Na₃P_O (aq) has the highest osmotic pressure

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

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

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

9.

K_f 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

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