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Practice each question, then open the answer or worked solution.
Which of the following units is useful in relating the concentration of a solution
with its vapour pressure?
Option (i) is the answer.
On dissolving sugar in water at room temperature solution feels cool to touch.
Under which of the following cases dissolution of sugar will be most rapid?
Option (iv) is the answer.
At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent
is __________.
(i) less than the rate of crystallisation
(ii) greater than the rate of crystallisation
(iii) equal to the rate of crystallisation
(iv) zero
Option (iii) is the answer.
A beaker contains a solution of a substance ‘A’. Precipitation of substance ‘A’
takes place when a small amount of ‘A’ is added to the solution. The solution is
_________.
(i) saturated
(ii) supersaturated
(iii) unsaturated
(iv) concentrated
Option (ii) is the answer.
The maximum amount of a solid solute that can be dissolved in a specified amount
of a given liquid solvent does not depend upon ____________.
(i) Temperature
(ii) Nature of solute
(iii) Pressure
(iv) Nature of solvent
Option (iii) is the answer.
Low concentration of oxygen in the blood and tissues of people living at high
altitude is due to ____________.
(i) low temperature
(ii) low atmospheric pressure
(iii) high atmospheric pressure
(iv) both low temperature and high atmospheric pressure
Option (ii) is the answer.
Considering the formation, breaking and strength of hydrogen bond, predict
which of the following mixtures will show a positive deviation from Raoult’s
law?
Option (i) is the answer.
Colligative properties depend on ____________.
(i) the nature of the solute particles dissolved in the solution.
(ii) the number of solute particles in solution.
(iii) the physical properties of the solute particles dissolved in the solution.
(iv) the nature of solvent particles.Solution:
Option (ii) is the answer.
9. Which of the following aqueous solutions should have the highest boiling point?
(i) 1.0 M NaOH
(ii) 1.0 M Na2SO4
(iii) 1.0 M NH4NO3
(iv) 1.0 M KNO3
Option (ii) is the answer.
The unit of ebulioscopic constant is _______________.
(i) K kg mol–1 or K (molality)–1
(ii) mol kg K–1 or K–1(molality)(iii) kg mol–1 K–1 or K–1(molality)–1
(iv) K mol kg–1 or K (molality)
Option (i) is the answer.
In comparison to a 0.01 M solution of glucose, the depression in the freezing point
of a 0.01 M MgCl2 solution is _____________.
(i) the same
(ii) about twice
(iii) about three times
(iv) about six times
Option (iii) is the answer.