CBSE
Multiple Choice QuestionsThe osmotic pressure of which solution is maximum? (consider that decimormal solution of each is 90% dissociated) :
Aluminium sulphate
Barium chloride
Sodium sulphate
A mixture of equal volumes of (b) and (c)
In aqueous alkaline solution, two electrons reduction of HO gives
HO-
H2O
O2
The mixture ofconcentrated HCl and HNO3 made in 3 : 1 ratio contains
ClO2
NOCl
NCl3
N2O4
Vapour pressure of benzene at 30°C is 121.8 mm. When 15 g of a non-volatile solute is dissolved in 250 g of benzene, its vapour pressure is decreased to 120.2 mm. The molecular weight of the solute is
35.67 g
356.7 g
432.8 g
502. 7 g
Assertion : The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.
Reason : Water is polar and benzene is non-polar.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
58.4 g of NaCl and 180 g of glucose were separately dissolved in l000mL of water. Identify the correct statement regarding the elevation of the boiling point (b.p) of the resulting solutions.
NaCl solution will show higher elevation of boiling point
Glucose solution will show higher elevation of boiling point
Both the solutions will show equal elevation of boiling point
The boiling point elevation will be shown by neither of the solutions
Which one of these, is not a colligative property ?
vapour pressure
osmotic pressure
lowering in freezing point
Elevation in boiling point
Which one of the following is not a buffer solution?
0.8M H2S + 0.8M KHS
2M C6H5NH2 + 2M C6H5NH3-Br-
3M H2CO3 + 3M KHCO3
0.05M KClO4 + 0.05M HClO4
The average osmotic pressure of human blood is 7.8 bar at 37°C. What is the concentration of an aqueous NaCl solution that could be used in the blood stream?
0.16 mol/L
0.32 mol/L
0.60 mol/L
0.45 mol/L
Which one of the statements given below concerning properties of solutions, describes a colligative effect?
Boiling point of pure water decreases by the addition of ethanol.
Vapour pressure of pure water decreases by the addition of nitric acid.
Vapour pressure of pure benzene decreases by the addition of naphthalene.
Boiling point of pure benzene increases by the addition of toluene.
