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JEE 2020 Chemistry : Solutions Quiz-2 (05.07.2019)

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Question 1

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6 °C will be : (K_f for water = 1.86 K kg mol^-1, and molar mass of ethylene glycol = 62 g mol^-1)

Question 2

Which one of the following aqueous solutions will exhibit highest boiling point?

Question 3

In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionization is 0.3. Taking K_f for water as 1.85, the freezing point of the solution will be nearest to

Question 4

Which one of the following statements is false?

Question 5

The vapour pressures of ethanol and methanol are 42.0 mm and 88.5 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 46.0 g of ethanol with 16.0 g of methanol. The mole fraction of methanol in the vapour is:

Question 6

The vapour pressures of ethanol and methanol are 44.5mm and 88.7mm Hg respectively at the same temperature. An ideal solution is formed by mixing 60gm of ethanol and 40gm of methanol. The mole fraction of methanol in the vapour phase is.

Question 7

Calculate the value of ‘i’ (vant-hoff factor) of AlCl₃ if it is completely dissociated in a solution.

Question 8

Vapour pressure of an aqueous solution of a non-volatile and non electrolyte solute at certain temperature T was found to be 39.964 torr. If the vapour pressure of pure solvent at same temperature is 40 torr, find the molality of aqueous solution:

Question 9

The diagram given below is a vapour pressure composition diagram for a binary solution of A and B

In the solution, A-B interactions are:

Question 10

An aqueous solution of methanol in water has vapour pressure

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