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JEE 2020 Chemistry : Solutions Quiz-1 (04.07.2019)

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Question 1

At 300 K, substance A having vapor pressure of 1.0 atm and substance B has a vapor pressure of 0.20 atm. A solution of A and B is prepared and allowed to equilibrate with its vapor. The vapor is found to have equal moles of A and B. What was the mole fraction of B in the original solution?

Question 2

What is the vapor pressure (in mmHg) of a solution of 2.38 g of Br2 in 105.0 g of CCl4 at 300 K? The vapor pressure of pure bromine at 300 K is 30.5 kPa and the vapor pressure of CCl4 is 16.5 kPa.

Question 3

For an ideal solution containing a nonvolatile solute, which of the following expressions represents the vapour pressure of the solutions?
where the subscripts 1 and 2 stand for solvent and solute, respectively

Question 4

pA and pB are the vapor pressure of pure liquid components, A and B, respectively of an ideal binary solution. If xA represents the mole fraction of component A, the total pressure of the solution will be

Question 5

12g of a nonvolatile solute dissolved in 108g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is :

Question 6

For an aqueous solution, freezing point is - 0.186 °C. Elevation of the boiling point of the same solution is (Kf = 1.86  mol-1 kg and Kb = 0.512 mol-1 kg):

Question 7

If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (ΔTf), when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is (Kf = 1.86 K kg mol–1).

Question 8

For a binary ideal liquid solution, the total pressure of the solution is given as

Question 9

If the total vapour pressure of the liquid mixture A and B is given by the equation: P = 180 XA + 90 then the ratio of the vapour pressure of the pure liquids A and B is given by:

Question 10

A solution containing 0.85g of ZnCl in 125 .0 g of water freezes at -0 .23oC. The apparent degree of dissociation of the salt is (Kf for water — 1 .86 K kg mol-1, atomic mass: Zn = 65 .3 and Cl = 35 .5)
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