A pair of isotonic solutions, among the following, is (assuming temperature to be the same) :
1. 0.1 (M) urea and 0.1 (M) NaCl
2. 0.1 (M) urea and 0.2 (M) MgCl2
3. 0.1 (M) NaCl and 0.1 (M) Na2SO4
4. 0.1 (M) Ca(NO3)2 and 0.1 (M) Na2SO4
The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol individually. The mixture shows:
1. No deviation from Raoult's law
2. Positive deviation from Raoult's law
3. Negative deviation from Raoult's law
4. That the solution is unsaturated
Amount of oxalic acid in grams that is required to obtain 250 ml of a semi-molar solution is -
1. | 17.75 g | 2. | 17.00 g |
3. | 15.75 g | 4. | 15.00 g |
A solution containing 3.3 g of a substance in 125 g of benzene (b.p. 80 °C) boils at 80.66 °C. If Kb for one litre of benzene is 3.28 °C m-1, the molecular weight of the substance shall be -
1. 127.20 g mol-1
2. 131.20 g mol-1
3. 137.12 g mol-1
4. 142.72 g mol-1
The molality of a solution containing a certain solute, if there is a freezing point depression of 0.184 °C, is-
(Kf = 18.4)
1. 0.01 m
2. 10 m
3. 0.05 m
4. 100 m
The Van't Hoff factor for 0.1 M Ba(NO3)2 solution is 2.74. The degree of dissociation is -
1. 91.3 %
2. 87 %
3. 100 %
4. 74 %
The latent heat of vaporization of water is 540 cal g-1 at 100 oC. Kb for water is:
1.
2.
3.
4.
Select the correct option based on statements below:
Assertion (A): | C2H5I and C2H5Br form an ideal solution. |
Reason (R): | The interaction between the components are similar to those in the pure components. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
17.4 % (w/v) solution at 27 C is isotonic to 5.85 % (w/V) NaCl solution at 27 C. lf NaCl is 100 % ionised, the % ionisation of in aqueous solution is-
[At wt. of K = 39, Na = 23] :-
1. 25 %
2. 75 %
3. 50 %
4. None of the above
The correct statement regarding a solution of two components A and B exhibiting positive deviation from ideal behaviour is :
1. | Intermolecular attractive force between A-A and B-B are stronger than those between A-B |
2. | ∆mixH = 0 at constant T and P |
3. | ∆mixV = 0 at constant T and P |
4. | Intermolecular attractive forces between A-A and B-B are equal to those between A-B |