AIPMT 2005 | Solutions Question 36 | Chemistry

AIPMT 2005

MCQ (Single Correct Answer)

-1

A solution of urea (mol. mass 56 g mol^$$-$$1) boils at 100.18^oC at the atmospheric pressure. If K_f and K_b for water are 1.86 and 0.512 K kg mol^$$-$$1 respectively, the above solution will freeze at

0.654^oC

$$-$$ 0.654^oC

6.54^oC

$$-$$6.54^oC

AIPMT 2005

MCQ (Single Correct Answer)

-1

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20^oC are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be

0.200

0.549

0.786

0.478

AIPMT 2005

MCQ (Single Correct Answer)

-1

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be

72 torr

140 torr

68 torr

20 torr

AIPMT 2002

MCQ (Single Correct Answer)

-1

A solution contains non volatile solute of molecular mass M₂. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure?

$${M_2} = \left( {{{{m_2}} \over \pi }} \right)VRT$$

$${M_2} = \left( {{{{m_2}} \over V}} \right){{RT} \over \pi }$$

$${M_2} = \left( {{{{m_2}} \over V}} \right)\pi RT$$

$${M_2} = \left( {{{{m_2}} \over V}} \right){\pi \over {RT}}$$

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