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Class XII Chemistry Solutions 3

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Question 1

The graphs of vapour pressure of substances P, Q, R, S are given below: Identify the substance if the different substances for which the graphs are drawn are C₆H₅NH₂, CS₂, CH₃OH, H₂O

Question 2

Kf for water is 1.86K kg moP1. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C2I-UO2) must you add to get the freezing point of the solution lowered to –2.8cC ?

Question 3

A mixture of carbon monoxide and carbon dioxide is found to have a density of 1.7 g/lit. at S.T.P. The mole fraction of carbon monoxide is

Question 4

Which of the following is correct for a non-ideal solution of liquids A and B, showing positive deviation?

Question 5

The density of 3 M solution of Na₂S₂O₃ is 1.58 g/ml. Calculate mole fraction of Na₂S₂O₃–

Question 6

The following plot is obtained for a binary solution of two volatile liquids A and B. Pick out the correct statement:
P_T = total vapour pressure of liquid A and B.
X_A = mole fraction of A in solution
P_A ° = vapour pressure of pure A
P_B ° = vapour pressure of pure B

Question 7

Water and chlorobenzene are immiscible liquids. Their mixture boils at 90 ºC under a reduced pressure of 9.58 × 10⁴ Pa. The vapour pressure of pure water at 90 ºC is 7.03 × 10⁴ Pa and molecular weight of chlorobenzene is 112.5. On what percent basis, chlorobenzene in the distillate is equal to –

Question 8

The vapour pressure of pure liquid solvent A is 0.80 atm. When a non-volatile substance B is added to the solvent, its vapour pressure drops to 0.60 atm. mol fraction of the component B in the solution is –

Question 9

The Van’t Hoff factor for 0.1 M La (NO₃)₃ solutions is found to be 2.74. The percentage dissociation of the salt is

Question 10

Which of these aqueous solution has the lowest boiling point?

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