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Quiz 1
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If 2 gm of NaOH is present is 200 ml of its solution, its molarity will be
0%
0.25
0%
0.5
0%
5
0%
10
Explanation
0.25
The atmospheric pollution is generally measured in the units of
0%
mass percentage
0%
volume percentage
0%
volume fraction
0%
ppm
Explanation
ppm
A 5% solution of cane-sugar (molecular weight = 342) is isotonic with 1% solution of substance A. The molecular weight of X is
0%
342
0%
171.2
0%
68.4
0%
136.8
Explanation
68.4
H
0%
0.0263 bar
0%
69.16 bar
0%
192 bar
0%
282 bar
Explanation
282 bar
Atomic mass is equal to
0%
number of electrons of an atom
0%
sum of the numbers of electrons and protons of an atom
0%
sum of the numbers of neutrons and protons of an atom
0%
none of these
Explanation
sum of the numbers of electrons and protons of an atom
Henry’s law constant for molality of methane is benzene at 298 K is 4.27 × 10
0%
1.78 × 10
0%
17.43
0%
0.114
0%
2.814
Explanation
1.78 × 10
How much oxygen is dissolved in 100 rnL water at 298 K if partial pressure of oxygen is 0.5 atm and K = 1.4 × 10
0%
22.4 mg
0%
22.4 g
0%
2.24 g
0%
2.24 mg
Explanation
2.24 mg
The law which indicates the relation’-hip between solubility of a gas in liquid and pressure rs
0%
Raoult’s law
0%
Henry’s law
0%
Lowering of vapour pressure
0%
Van’t Hoff law
Explanation
Henry’s law
Among the following substances the lowest vapour pressure is exerted by
0%
water
0%
alcohol
0%
ether
0%
mercury
Explanation
mercury
Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?
0%
20
0%
50
0%
100
0%
200
Explanation
50
Partial pressure of a solution component is directly proportional to its mole fraction. This is known as
0%
Henry’s law
0%
Raoult’s law
0%
Distribution law
0%
Ostawald’s dilution law
Explanation
Raoult’s law
3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?
0%
80 torr
0%
140 torr
0%
72 torr
0%
70 torr
Explanation
72 torr
Which of the following solutions shows positive deviation from Raoult’s law?
0%
Acetone + Aniline
0%
Acetone + Ethanol
0%
Water + Nitric acid
0%
Chloroform + Benzene
Explanation
Acetone + Ethanol
The system that forms maximum boilingazetrope is
0%
Acetone-chloroform
0%
ethanol-acetone
0%
n-hexane-n-heptane
0%
carbon disulphide-acetone
Explanation
Acetone-chloroform
A plant cell shrinks when it is kept in a
0%
hypotonic solution
0%
hypertonic solution
0%
isotonic solution
0%
pure water
Explanation
hypertonic solution
The relative lowering in vapour pressure is proportional to the ratio of number of
0%
solute molecules to solvent molecules
0%
solvent molecules to solute molecules
0%
solute molecules to the total number of molecules in solution
0%
solvent molecules to the total number of molecules in solution
Explanation
solute molecules to the total number of molecules in solution
A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?
0%
91.8 g
0%
1198 g
0%
83.9 g
0%
890.3 g
Explanation
91.8 g
What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10°C ?
0%
496 g
0%
297 g
0%
310 g
0%
426 g
Explanation
297 g
The osmotic pressure of a solution can be increased by
0%
increasing the volume
0%
increasing the number of solute molecules
0%
decreasing the temperature
0%
removing semipermeable membrane
Explanation
increasing the number of solute molecules
Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is
0%
lowering in vapour pressure of snow
0%
depression in freezing point of snow
0%
melting of ice due to increase in temperature by putting salt
0%
increase in freezing point of snow
Explanation
depression in freezing point of snow
0 h : 0 m : 1 s
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