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Class XII Chemistry Solutions 2

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Question 1

A total pressure of 3 atm when applied on the surface of solution of concentration 0.11 M prevent flow of solvent across semipermeable membrane from other side of solution of concentration of 0.01 M. What is the temperature (in K)of experiment? (Take : R = 0.08 L-atm/K-mole)

Question 2

Which of the following plots represents an ideal binary mixture?

Question 3

How many mL of 2.50% (m/v) salt solution would contain 1.80 g of salt?

Question 4

If mole fraction of NaCl_(aq) is same as that of water then molality of NaCl is

Question 5

An ideal mixture of liquids A and B with 2 moles of A and 2 moles of B has a total vapour pressure of 1 atm at a certain temperature. Another mixture with 1 mole of A and 3 moles of B has a vapour pressure greater than 1 atm. But if 4 moles of C are added to the second mixture, the vapour pressure comes down to 1 atm. Vapour pressure of C in pure state is 0.8 atm. Calculate the vapour pressure of pure A and pure B: -

Question 6

A solution at 20°C is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively:

Question 7

Given P-x curve for a non-ideal liquid mixture (fig.). Identify the correct T-x curve for the same mixture –

Question 8

In a binary solution, the degree of dissociation (a) of a weak electrolyte A_xB_y is related to van't Hoff factor (i). what is the expression for van’t Hoff factor?

Question 9

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 10

The density of 3M solution of sodium thioslphate (Na₂S₂O₃) is 1.58 g/ml. Calculate the amount of Na₂S₂O₃ by w/w %

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Feb 20JEE & BITSAT