Solutions Test

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Solutions Test - 1

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Weekly Quiz Competition

Question 1

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Match the following:

Column – I	Column – II
(A) Ideal solution	(a) Raoult's law
(B) Non-ideal solution	(b) ΔH ≠ 0
(C) Degree of dissociation of solute	(c) Solutions with the same vapour pressure at a temperature
(D) Isopiestic solution	(d) ΔH = 0
	(e) Van't Hoff factor

(A) – (a), (d); (B) – (b); (C) – (e); (D) – (c)

(A) – (b), (c); (B) – (d), (c); (C) – (b); (D) – (a)

(A) – (c), (a); (B) – (b), (d); (C) – (a); (D) – (b)

(A) – (d), (b); (B) – (c), (e); (C) – (d); (D) – (d)

Solution

(A) An ideal solution obeys Raoult's law (a) and ΔH = 0 for the formation of such solutions (d).
Thus, (A) – (a), (d).

(B) Non-ideal solutions do not obey Raoult's law and for such solutions, Δ H ≠ 0 during their formation (b).
Thus, (B) - (b).

(C) Degree of dissociation of an electrolytic solute can be determined by Van 't Hoff factor (e).
Thus, (C) – (e).

(D) Solutions with the same vapour pressure at a particular temperature (c) are called isopiestic.
Thus, (D) – (c).

Question 2
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Which one of the following pairs of solution can we expect to be isotonic at the same temperature?

A
0.1 M urea and 0.1 M NaCl

B
0.1 M urea and 0.2 M MgCl₂

C
0.1 M NaCl and 0.1 M Na₂SO₄

D
0.1 M Ca(NO₃)₂ and 0.1 M Na₂SO₄

Solution

'i' for Ca(NO₃)₂ and Na₂SO₄ is 3 each. Their colligative molarities are also the same. Hence, 0.1 M Ca(NO₃)₂ and 0.1 M Na₂SO₄ solutions are isotonic.

Question 3

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Match the following:

Column – I	Column – II
(A) Positive deviation from Raoult's law	(a) Osmotic pressure method
(B) Addition of HgI2 to KI solution	(b) Isotonic with human blood
(C) Accurate method of determination of molar mass of a protein	(c) Binary liquid mixtures
(D) 0.9% NaCl solution	(d) Elevation of freezing point of solution

(A) – (c), (B) – (d), (C) – (a), (D) – (b)

(A) – (b), (B) – (a), (C) – (d), (D) – (c)

(A) – (a), (B) – (b), (C) – (b), (D) – (d)

(A) – (d), (B) – (c), (C) – (c), (D) – (a)

Solution

(A) Binary liquid mixtures exerting a repulsive force on each other show positive deviation from Raoult's law as more molecules are sent to the vapour phase.
Thus, (A) – (c).

(B) Addition of HgI2 to KI solution decreases the total concentration as

HgI2(s) + 2 (K⁺ + I-) → 2^K+ + [HgI4]^2-. Thus, 3 ions are produced from 3 ions. So, the depression of freezing point becomes less, i.e. there will be elevation of freezing point of solution.
So, (B) – (d).

(C) Osmotic pressure method gives the most accurate molecular weight of proteins. So, (C) – (a).
(D) 0.9% NaCl or normal saline is isotonic with human blood. Thus, (D) – (b).