Questions
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)
Answer:300 ml, 700ml
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)
Answer: 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 ?
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)
Answer:1.95
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)
Answer: 271.8oK
6
1.4 m aqueous solution of a weak electrolyte AB2 ionizes 20%, then, state boiling point and freezing point of the solution respectively.
Answer: 101oC, -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)
Answer: 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.
Answer:0.035
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.
Answer: 1:3
10
Naphthalene is soluble in ether or benzene because. ?
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.
(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.
Answer: I, IV
12
Which of the following is applicable for the solubility of gases in liquid.
Answer: Increases with decrease in temp and increase in pressure.
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