Solutions Chemistry MCQs

A true solution is a homogeneous mixture of two or more substances with a composition that can be varied within certain limits. “Homogeneous” means that the composition is uniform throughout. A solution with only two components is known as a binary solution. Solutions are classified based on the type of solvent used. If the solvent is water, the solution is termed an aqueous solution; if the solvent is alcohol, it is called an alcoholic solution. A solution where the solute is present in very low concentration is referred to as a dilute solution.

The mole fraction of the solute in one molal aqueous solution is

(a) 0.009
(b) 0.018
(c) 0.027
(d) 0.036

Mixing equal volumes of 0.1 M NaOH and 0.1 M CH₃COOH yields a solution which is:

(a) basic
(b) acidic
(c) neutral
(d) none

The relationship between osmotic pressure at 273 K when 10 g of glucose (P1), 10 g of urea (P2), and 10 g of sucrose (P3) are dissolved in 250 ml of water is:

(a) P1 > P2 > P3
(b) P3 > P1 > P2
(c) P2 > P1 > P3
(d) P2 > P3 > P1

Two liquids X and Y form an ideal solution. At 300 K, the vapor pressure of the solution containing 1 mol of X and 3 mol of Y is 550 mm Hg. If 1 mol of Y is further added to this solution, the vapor pressure increases by 10 mm Hg. The vapor pressures of X and Y in their pure states will be respectively:

(a) 300 and 400
(b) 400 and 600
(c) 500 and 600
(d) 200 and 300

When 5 cm³ of acetone is added to 100 cm³ of water, the vapor pressure of water over the solution will be:

(a) equal to the vapor pressure of pure water
(b) less than the vapor pressure of pure water
(c) greater than the vapor pressure of pure water
(d) very large

The volume of 0.025 M H₃PO₄ required to neutralize 25 ml of 0.03 M Ca(OH)₂ is:

(a) 20 ml
(b) 25 ml
(c) 40 ml
(d) 50 ml

Which of the following should be done to prepare 0.4 M NaCl starting with 100 ml of 0.3 M NaCl?

(a) add 5.85 g of NaCl and 20 ml water
(b) add 0.01 mol NaCl
(c) evaporate 10 ml of water
(d) none

If at a certain temperature the vapor pressure of pure water is 25 mm Hg and that of a very dilute aqueous urea solution is 24.5 mm Hg, the molality of the solution is:

(a) 0.02
(b) 1.2
(c) 1.11
(d) 0.08

Equal volumes of 0.1 M AgNO₃ and 0.2 M NaCl are mixed. The concentration of NO₃⁻ ions in the mixture will be:

(a) 0.1 M
(b) 0.05 M
(c) 0.2 M
(d) 0.15 M

The density of a solution prepared by dissolving 129 g of urea in 1000 g of water is 1.15 g/ml. The molarity of this solution is:

(a) 1.78 M
(b) 1.02 M
(c) 2.05 M
(d) 0.50 M