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Free download in PDF Class 12 Chemistry Chapter 2 Solutions Multiple Choice Questions (MCQs) and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Equal volumes of 0.1M AgNO3 and 0.2M NaCl are mixed. The concentration of NO3– ions in the mixture will be
[A]
0.1M
[B]
0.05M
[C]
0.2M
[D]
0.15M
(2)
Which of the following should be done in order to prepare 0.4M NaCl starting with 100ml of 0.3M NaCl?
[A]
add 5.85g of NaCl
[B]
and 20ml water
[C]
add 0.01 mol NaCl
[D]
evaporate 10ml of water
Answer: add 0.01 mol NaCl
(3)
The volume of 0.025M H3PO4 required to neutralise 25ml of 0.03M Ca(OH)2 is
[A]
20ml
[B]
25ml
[C]
40ml
[D]
50ml
(4)
The mole fraction of the solute in one molal aqueous solution is
[A]
0.009
[B]
0.018
[C]
0.027
[D]
0.036
(5)
5 cm3 of acetone is added to 100 cm3 of water, the vapour pressure of water over the solution will be
[A]
equal to the vapour pressure of pure water
[B]
less than the vapour pressure of pure water
[C]
greater than the vapour pressure of pure water
[D]
very large
Answer: less than the vapour pressure of pure water
(6)
The density of a solution prepared by dissolving 129g of urea in 1000g of water is 1.15g/ml. The molarity of this solution is
[A]
1.78M
[B]
1.02M
[C]
2.05M
[D]
0.50M
(7)
If at a certain temperature the vapour pressure of pure water is 25 mm Hg and that of a very dilute aqueous urea solution is 24.5 mm Hg, the molality of the solution is:
[A]
0.02
[B]
1.2
[C]
1.11
[D]
0.08
(8)
The relationship between osmotic pressure at 273K when 10g glucose (P1), 10g urea (P2) and 10g sucrose (P3) are dissolved in 250ml of water is
[A]
P1 > P2 > P3
[B]
P3 > P1 > P2
[C]
P2 > P1 > P3
[D]
P2 > P3 > P1
(9)
Two liquids X and Y form an ideal solution. At 300K vapour pressure of the solution containing 1mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, the vapour pressure of the solution increases by 10 mm Hg. Vapour pressure of X and Y in the pure states will be respectively
500 and 600
200 and 300
Answer: (b)
[A]
300 and 400
[B]
400 and 600
[C]
Both Frenkel and Schottky defects
[D]
cation excess defect
(10)
Mixing up equal volumes of 0.1M NaOH and 0.1M CH3COOH yields a solution which is
[A]
basic
[B]
acidic
[C]
neutral
[D]
None
(11)
Which of the following possesses physical state of solute and solvent are liquid and solid respectively ?
[A]
solution of sugar in water
[B]
zinc amalgam
[C]
solution of Naphthelene in benzene
[D]
brass
(12)
Which of the following alternative is correct for physical state of solute and solvent for a solution of camphor in N2 gas ?
[A]
solid, gas
[B]
solid, liquid
[C]
gas, solid
[D]
gas, gas
(13)
Which of the following is an example of solid solution ?
[A]
interstitial compound of hydrogen and Pd
[B]
WC
[C]
Zn / Hg
[D]
Given all
(14)
Which of the following pair of solution having same physical state of solute ?
[A]
homogenous mixture of chloroform in N2 gas, solution of CO2 in water
[B]
brass, sodium amalgam
[C]
homogenous mixture of camphor in N2 gas, solution of H2 gas in Pd metal
[D]
moist air, solution of ethanol in water
Answer: moist air, solution of ethanol in water
(15)
Which of the following pair of solution having same physical state of solvent ?
[A]
homogenous mixture of chloroform in N2 gas, solution of CO2 in water
[B]
brass, solution of salt in water
[C]
homogenous mixture of camphor in N2 gas, moist air
[D]
solution of H2 gas in Pd metal, solution of ethanol in water
Answer: homogenous mixture of camphor in N2 gas, moist air
(16)
Which of the following pair of solution having different physical state of solute ?
[A]
homogenous mixture of chloroform in N2 gas, solution of CO2 in water
[B]
brass, homogenous mixture of camphor in N2 gas
[C]
sodium amalgam, moist air
[D]
solution of H2 gas in Pd metal mixture of N2 and O2
Answer: homogenous mixture of chloroform in N2 gas, solution of CO2 in water
(17)
Which of the following pair of solution having different physical state of solvent ?
[A]
homogenous mixture of N2 gas in chloroform, mixture of N2 and O2
[B]
brass, solution of H2 gas in Pd metal
[C]
sodium amalgam, solution of urea in water
[D]
solution of CO2 in water, solution of Naphthelene in benzene
Answer: sodium amalgam, solution of urea in water
(18)
Which of the following compound possesses maximum solubility in water ?
[A]
pentan – 1 - ol
[B]
Pentane – 2, 3 – diol
[C]
pentane – 1, 2, 3 – triol
[D]
Pentane – 1, 2, 3, 4 – tetraol
Answer: Pentane – 1, 2, 3, 4 – tetraol
(19)
Which of the following given compound is least soluble in water ?
[A]
Hexan – 1 – ol
[B]
glycerol
[C]
Propane – 1, 3 – diol
[D]
ethylene glycol
(20)
To convert molarity into which of the following unit of concentration, does not require density of the solution ?
[A]
molality
[B]
normality
[C]
mole-fraction
[D]
% w/w
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