Multiple Choice QuestionsWhat are the products formed when chlorine is passed through aqueous hypo solution?
Na2SO3 + HCl + S
Na2SO3 + SO3 + HCl
Na2SO4 + HCl + S
Na2SO4 + HCl + SO2
The vapour pressure of water at 23°C is 19.8 mm, 0.1 mole of glucose is dissolved in 178.2 g ofwater. What is the vapour pressure (in mm) ofthe resultant solution?
19.0
19.602
19.402
19.202
Assertion (A) : The aqueous solution of CH3COONa is alkaline in nature.
Reason (R) : Acetate ion undergoes anionic hydrolysis.
The correct answer is
both (A) and (R) are true and (R) is the correct explanation of (A).
both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is not true.
A) is not true but (R) is true.
During the depression in freezing point experiment, an equilibrium is established between the molecules of
liquid solvent and solid solvent
liquid solute and solid solvent
liquid solute and solid solute
liquid solvent and solid solute
If BaCl2,ionizes to an extent of 80% in aqueous solution, the value of van't Hoff factor is
2.6
0.4
0.8
2.4
X is a non-volatile solute and Y is a volatile solvent. The following vapour pressures are observed by dissolving X in Y.
| X/mol L-1 | Y/mm of Hg |
| 0.10 | p1 |
| 0.25 | p2 |
| 0.01 | p3 |
The correct order of vapour pressures is
p1 < p2 <p3
p3 < p2 < p1
p3 <p1 < p2
p2 <p1 <p3
D.
p2 <p1 <p3
When a non-volatile solute is added to a volatile solvent, the solute covers up some of the surface of solvent. Thus, less surface area is available for vaporisation of solvent and hence,
vapour pressure decreases. As the amount of non-volatile solute increases, vapour pressure
decreases accordingly.
The order of concentration of X is
0.01 < 0.10 < 0.25
The order of vapour pressure is
p2 <p1 <p3
Which one of the followng is an isotonic pair of solutions?
0.15 M NaCl and 0.11 M Na2SO4
0.2 M Urea and 0.1 M Sugar
0.1 M BaCl2 and 0.2 M Urea
0.4 M MgSO4 and 0.1 M NH4Cl
The vapour pressure in mm of Hg, of an aqueous solution obtained by adding 18 g of glucose (C6H12O6) to 180g of water at 100°C is
76.0
7.60
759
752.4
The weight in grams of a non-volatile solute (mol. wt. 60) to be dissolved in 90 g of water to produce a relative lowering of vapour pressure of 0.02 is
4
8
6
10
The experimentally determined molar mass of a non-volatile solute, BaCl2 in water by Cottrell's method, is
equal to the calculated molar mass
more than the calculated molar mass
less than the calculated molar mass
double of the calculated molar mass
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