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Free download in PDF Class 12 Chemistry Chapter 2 Solutions Short Questions with 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 would be tne volume of 15% w/v and 5% w/v NaOH solution required to prepare 1 litre aqueous solution of 2M NaOH ? (M.w of Naoh = 40 gram/mole)
[A]
300 ml, 700ml
[B]
250 ml, 750ml
[C]
400 ml, 600ml
[D]
280 ml, 720ml
(2)
At constant temperature, vapour pressure of an aqueous solution of 1.5 kg glucose decreases to 0.98% in comparision with vapour pressure of pure water then, what quantity of glucose in gram dissolved in the solution ? (Molecular weight of glucose = 180 gm/mole)
[A]
148.5 gm
[B]
14.85 gm
[C]
125 gm
[D]
135 gm
(3)
At constant pressure, 0.5 m NaCl aqueous solution is diluted by adding water in it. Which of the following statement is correct in this reference ?
[A]
Van’t Hoff factor (i) and boiling point of the solution both decreases
[B]
Van’t Hoff factor (i) and boiling point of the solution both increases
[C]
Van’t Hoff factor (i) decreases while boiling point of the solution both increases
[D]
Van’t Hoff factor (i) increases while boiling point of the solution both decreases
Answer: Van’t Hoff factor (i) increases while boiling point of the solution both decreases
(4)
Boiling point of an aqueous solution of 0.5 m ionic solid substance is 100.5°C; then state the value of i ? (Kb = 0.512oC -kg – mole-1)
[A]
1.95
[B]
1.85
[C]
1.25
[D]
0.85
(5)
Aqueous solution of substance boils at 100.5oC at 1 bar pressure; then at what temperature it freezes ? (Kb = 0.512oC -kg - mole-1, Kf = 1.86oC - kg – mole-1)
[A]
11.2oC
[B]
29.84oF
[C]
271.8oK
[D]
-1.2oC
(6)
1.4 m aqueous solution of a weak electrolyte AB2 ionizes 20%, then, state boiling point and freezing point of the solution respectively.
[A]
100.86oC, -3.12oC
[B]
101oC, -3.65oC
[C]
274oC, -3.65oC
[D]
374oC, -3.65oC
(7)
Solute substance in a 1.4 m aqueous solution associates by 25%, then, find the boiling point and freezing point of solution; where, solute exists as trimer in the solution; thus, n = 3. (Kb =0.512oC • kg • mole-1, Kf = 1.86oC • kg • mole-1)
[A]
100.448oC, -2.28oC
[B]
373.58oK, -3.65oC
[C]
100.59oC, 2.17oC
[D]
213oF, 270.83ok
(8)
Molecular mass of a weak acid HA is 60gm/mo1 Ifs experimental molecular mass in its 0.7 M aqueous solution obtained from colligative properties is 50gm/mo1. Then calculate ionistion consteint of weak acid HA.
[A]
0.023
[B]
0.0085
[C]
0.035
[D]
0.085
(9)
At constant temperature, the total pressure of a homogeneous mixture of gas-A and gas-B in a closed container collected on water is 2.0 bar. Their ratio of mole frachion is 1.6 If the values of their KH are 2.4 ×10+4 bur and 4.8 ×104 bar respectively then calcwate its ration of mole fraction when dissolhed in H2O.
[A]
1:2
[B]
2:1
[C]
3:1
[D]
1:3
(10)
Naphthalene is soluble in ether or benzene because. ?
[A]
dipole-dipole attraction is equal
[B]
London forces are equal
[C]
Hydrogen bond
[D]
Ionic attraction
Answer: London forces are equal
(11)
Four Liauids are given.
(i) Water : more polar and capacity to torm H-bond.
(ii) Hexanol : moderatly pdar and partial capacity to form H-bond.
(iii) Chloro form : moderatly polar and does not capable to form H-bond.
(iv) Octane : non polar and does not capable to form H-bond.
which of the following pair of liquids mixed with each other in very less proportion.
[A]
I, IV
[B]
I, II
[C]
II, III
[D]
III, IV
(12)
Which of the following is applicable for the solubility of gases in liquid.
[A]
Increases with increase in temperature and pressure.
[B]
Decreases with increase in temp and pressure.
[C]
Increases with decrease in temp and increase in pressure.
[D]
Decreases with decrease in temp and increase in pressure.
Answer: Increases with decrease in temp and increase in pressure.
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