AIEEE 2011 | Solutions Question 128 | Chemistry

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

0.0372 K

0.0558 K

0.0744 K

0.0186 K

AIEEE 2010

MCQ (Single Correct Answer)

-1

On mixing, heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components (heptane and octane) are 105 kPa and 45 kPa respectively. Vapour pressure of the solution obtained by mixing 25.0g of heptane and 35 g of octane will be (molar mass of heptane = 100 g mol^–1 and of octane = 114 g mol^–1)

72.0 kPa

36.1 kPa

96.2 kPa

144.5 kPa

AIEEE 2009

MCQ (Single Correct Answer)

-1

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?

The solution formed is an ideal solution

The solution is non-ideal, showing +ve deviation from Raoult’s law.

The solution is non-ideal, showing –ve deviation from Raoult’s law.

n-heptane shows +ve deviation while ethanol shows –ve deviation from Raoult’s law.

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