A 2.0% solution by weight of urea in water shows a boiling point elevation of 0.18 deg [Molecular weight of urea=60]. Calculate the latent heat of vaporization per gram of water.

1. 495.3 cal/g

2. 560.3 cal/g

3. 525.8 cal/g

4. 501.3 cal/g

A solution of 18 g of glucose in 1000 g of water is cooled to -0.2 ^oC. The amount of ice separating out from this solution is -

[K_f(H₂O) = 1.86 K molal^-1]

The partial pressure of ethane over a saturated solution containing 6.56 X 10^-2 g of ethane is 1 bar. If the solution contains 5.00 X 10^-2 g of ethane, then what shall be the partial pressure of the gas?

1. 0.76 bar

2. 0.16 bar

3. 1.16 bar

4. 3.12 bar

In a dilute solution, any colligative property depends on 

1. The total number of neutral species in the solution

2. The total number of ionic species in the solution

3. The total number of species irrespective of whether they are ionic or non-ionic.

4. The types of forces operating between the non-ionic species, ionic species and the solvent molecules

An aqueous solution of 2 percent non volatile solute exerts a pressure of 1.004 bar at the boiling point of the solvent. What is the molecular mass of the solute ?

1. 9.19 g mol^-1

2. 41.3 g mol^-1

3. 71.2 g mol^-1

4. 50.4 g mol^-1

An aqueous solution of hydrochloric acid -

1. Obeys Raoult's law

2. Shows negative deviations from Raoult's law

3. Shows positive deviations from Raoult's law

4. Obeys Henry's law at all compositions

1000 gm of 1 m sucrose solution in water is cooled to -3.534$°\mathrm{C}$. What weight of ice would be separated out at this temperature ? ${\mathrm{K}}_{\mathrm{f}}^{\text{'}}\left({\mathrm{H}}_2\mathrm{O}\right)=1.86 \mathrm{K} {\mathrm{mol}}^{-1}\mathrm{kg}.$

1. 352.98 gm.

2. 252.98 gm.

3. 302.98 gm.

4. 152.12 gm

Osmotic pressure of equimolar solution of BaCl₂, NaCl and glucose will be in the order -

1. BaCl₂ > NaCl > glucose

2. glucose > NaCI > BaCl₂

3. NaCl > BaCl₂ >glucose

4. NaCl> glucose > BaCl₂

Nalorphene (C₁₉H₂₁NO₃), similar to morphine, is used to combat withdrawal symptoms in narcotic users. Dose to nalorphene generally given is 1.5 mg. Calculate the mass of 1.5 X 10⁻³ m aqueous solution required for the above dose is?

1. 3.2 g

2. 0.2 g

3. 5.1 g

4. 7.3 g

Which solution will have the highest boiling point ?

1. 1 (M) C₆H₁₂O₆ solution

2. 1 (M) NaCl solution

3. 1 (M) BaCl₂ solution

4. 1 (M) CO(NH₂)₂ solution