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21) If 50 ml of 0.50 M NaCl solution is diluted with water to a volume of
500 ml the new concentration of solution is:
a) 0.16 M
b) 0.05 M
c) 0.08 M
d) 0.04 M
ANSWER : 0.05 M
22) Which of the following does not changes with the change in temperature?
i. Mole fraction. ii. Molality.
a) None of the above.
b) Both i & ii
c) i.
d) Only ii.
ANSWER : Both i & ii
23) A solution contains 20.0g of glucose, C6H12O6,
in 100 g of water. What is the freezing point of the solution ( Kf = 1.86°C / m
)?
a) – 2.06°C.
b) – 0.20°C.
c) + 0.32°C.
d) – 0.32°C.
ANSWER : – 2.06°C.
24) The osmotic pressure of 0.020 M solutions of KI and of sucrose ( C12H22O11
) are 0.565 atm and 0.345 atm respectively. The Van’t Hoff factor for KI
is:
a) 0.63.
b) 1.63.
c) 1.90.
d) 0.90.
ANSWER : 1.63.
25) The Ebullioscopic constant is 0.516 K kg mol-1. .What is the
latent heat of vaporization, if the b.p of water is 100°C.
a) 7900 cal / mol.
b) 8100 cal / mol.
c) 9700 cal / mol.
d) 6200 cal / mol.
ANSWER : 9700 cal / mol.
26) The value of 0.03 M Ca(OH) 2 required to neutralise 20 ml of
0.025 M H3 PO4 is
a) 25 ml.
b) 50 ml.
c) 40 ml.
d) 55 ml.
ANSWER : 25 ml.
27) Rectified spirit contains ……………. % ethanol by mass.
a) 99
b) 91
c) 95
d) 98
ANSWER : 95
28) The molarity of 4.6 N H2SO4 solution is:
a) 0.46 M.
b) 0.23 M.
c) 4.6 M.
d) 2.3 M.
ANSWER : 2.3 M.
29) 60 ml of an acidic solution is neutralised by 30 ml of 0.4 N base. The
strength of acid solution is :
a) 0.1 N.
b) 0.3 N.
c) 0.4 N.
d) 0.2 N.
ANSWER : 0.2 N.
30) …………. Shows the presence of strong intermolecular forces in a liquid.
a) A low heat of vaporization.
b) A low critical temperature.
c) A low vapour pressure.
d) A low boiling point.
ANSWER : A low vapour pressure.
Part 1
Part 2
Part 3
Part 4
Part 5
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