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Free download in PDF Class 12 Chemistry Chapter 2 Solutions Short Questions 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>
What quantity of urea required to prepare 20 % w/w solution having weight 150 gm ?
[A]
20 gm
[B]
40 gm
[C]
10 gm
[D]
30 gm
(2)
What is the normality of an aqueous solution of 0.5 Al2(SO4)3 ?
[A]
3 N
[B]
1 N
[C]
1.5 N
[D]
2.5 N
(3)
What will be the mole-fraction of ethanol in solution, prepared by dissolving 9.2 gm ethanol in 900 gm water ? (Molecular weight of water and ethanol are 18 and 48 gm/mole respectively)
[A]
0.04
[B]
0.004
[C]
0.4
[D]
0.0004
(4)
What will be the mole-fraction of water and NaOH respectively, when 260 gm NaOH dissolved in 1.8 kg water ? (M.W of watll Naoh = 18440)
[A]
0.96, 0.4
[B]
0.0962, 0.38
[C]
0.0962, .038
[D]
0.962, 0.0038
(5)
What would be the mole-fraction of solute in an aqueous solution of a substances heaving strength 4.5 m ?
[A]
0.75
[B]
0.075
[C]
0.45
[D]
0.045
(6)
The density of 98% w/w H2SO4 solution is 1.8 gm/mole then, molarity of the solution is -
[A]
20 M
[B]
10 M
[C]
18 M
[D]
None of these
(7)
Molarity and molality of an aqueous solution of H2SO4 are 1.56 (M) and 1.8 (M) respectively; then, waqht will be the density of the solution ?
[A]
1.835 gm/ml
[B]
1.55 gm/ml
[C]
1.02 gm/ml
[D]
1.725 gm/ml
(8)
A solution is preparesd from A, B, C and D mole-fraction of A, B and C are 0.1, 0.2 and 0.4 respectively then, mole-fraction of D is -
[A]
0.2
[B]
0.1
[C]
0.3
[D]
0.4
(9)
The density of 4 M H2SO4 solution is 1.992 gm/ml then, what will be the molality of the solution ? (Molecular weight of H2SO4 is 98 gm/mole)
[A]
3 M
[B]
3.5 M
[C]
1.2 M
[D]
0.4 M
(10)
Molarity of 1.2 N aqueous solution of AlCl3 is -
[A]
3.6 m
[B]
2.4 m
[C]
1.2 m
[D]
0.4 m
(11)
What will be the molality of the solution prpared using 500 gm of 25 % w/w NaOH and 500 gm of 15 % w/w NaOH solution ? (Molecular weight of NaOH = 40 gm/mole)
[A]
12.74 m
[B]
6.25 m
[C]
9 m
[D]
5 m
(12)
What wiil be the molality of solution prepared by taking 25 % w/w NaOH and 15 % w/w NaOH solution ? (Molecular weight of NaOH = 40 gm/mole)
[A]
12.74 m
[B]
5.5 m
[C]
9 m
[D]
4 m
(13)
The density of 2.5 M NaOH solution is 1.15 gm/ml; then, which of the following alternative is correct for molarity and molality ?
[A]
M > m
[B]
M < m
[C]
M = m
[D]
can’t be predicted
(14)
Which of the following is correct for an ideal solution ?
[A]
“H = 0, “V = 0, “S = 0
[B]
“H `” 0, “V = 0, “S = 0
[C]
“H = 0, “V = 0, “S `” 0
[D]
“H = 0, “V `” 0, “S = 0
Answer: “H = 0, “V = 0, “S `” 0
(15)
Boiling point of Aqueous solutions of 0.05 m ABC and 0.02 m X2Y3 are same at 1 bar pressure; then, what will be the values of Van’t Hoff factor (i) for solute in both the solutions ?
[A]
1.04, 5.1
[B]
1.9, 4.75
[C]
1.2, 3.4
[D]
1.5, 3.7
(16)
Which of the following substances having concentration of aqueous solution 1% w/w, possesses higher boiling point ? (Molecular weight of Kcl, BaCl2, glucose and Al2(SO4)3 are 74.5, 208, 342 gm’mole respectively) (Assume that inonic solids dissociates completely in their aqueous solution)
[A]
KCl
[B]
BaCl2
[C]
glucose
[D]
Al2(SO4)3
(17)
Molecular weight of biomolecules such as protein can be determined by ______ method.
[A]
osmotic pressure measurement
[B]
Depression in freezing point measurement
[C]
Elevation in boiling point measurement
[D]
Vapour pressure measurement
Answer: osmotic pressure measurement
(18)
What will be the elevation in boiling point of an aqueous solution of 0.5 m NaCl ? ( i = 1.8)
[A]
2.04, 5.1
[B]
1.9, 4.57
[C]
1.2, 3.4
[D]
1.4, 3.7
(19)
At 353 K temperature, the Vapour pressure of pure liquids A and B are 600mm and 800 mm respectively. If mixture of liquids A and B boils at 353 K and 1 bar pressure, then mole proportion of B in percent is -
[A]
80%
[B]
60%
[C]
20%
[D]
40%
(20)
What amount of urea dissolved in 1 kg water at constant temperature, so that vapour pressure of the solution reduced by 2% ? ( M.W of urea = 60 gm/mole)
[A]
68 gm
[B]
60 gm
[C]
50 gm
[D]
75 gm
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