Which gas when passed through dilute blood will impart a cherry red colour to the solution?
1. CO2
2. COCl2
3. NH3
4. CO
The vapour density of undecomposed N2O4 is 46. When heated, vapour density decreases to 24.5 due to its dissociation to NO2. The percent dissociation of N2O4 at the final temperature is:
1. 87
2. 60
3. 40
4. 70
At 298 K, 500cm3 H2O dissolved 15.30 cm3 CH4(STP) under a partial pressure of methane of one atm. If Henry's law holds, what pressure is required to cause 0.001 mole methane to dissolve in 300cm3 water ?
1. 0.29 atm
2. 2.33 atm
3. 1.29 atm
4. 3.11 atm
The molal depression constant for water=1.85 deg/molal and for benzene is 5.12 deg/molal. If the ratio of the latent heats of fusion of benzene to water is 3:8, calculate the freezing point of benzene.
1. 6.75
2. 5.12
3. 8.97
4. 6.1
Which of the following colligative properties is associated with the concentration term 'molarity'?
1. Lowering of vap.pressure
2. Osmotic pressure
3. Depression in freezing point
4. Elevation in boiling point
The vapour pressure of a dilute aqueous solution of glucose is 750 mm of Hg at 373 K. The mole fraction of solute in the solution is-
1. 1/10
2. 1/76
3. 1/7.6
4. 1/35
Which pair of solutions is likely to exhibit isotonicity at a constant temperature?
1. | 0.1 (M) Urea and 0.1 (M) NaCl |
2. | 0.1 (M) Urea and 0.2 (M) MgCl2 |
3. | 0.1 (M) NaCl and 0.1 (M) Na2SO4 |
4. | 0.1 (M) Ca(NO3)2 and 0.1 (M) Na2SO4 |
The latent heat of vapourisation of water is 540 cal g-1 at 100. Kb for water is
1. 0.56 K.mole-1
2. 1.86 K.mole-1
3. 0.51 K.mole-1
4. 5.12 K.mole-1
Which of the following aqueous solution has osmotic pressure nearest to that an equimolar solution of K4[Fe(CN)6]?
1. Na2SO4
2. BaCl2
3. Al2(SO4)3
4. C12H22O11
The molar volume of liquid benzene (density= 0.877 g ml-1) increases by a factor of 2750 as it vapourises at 20. At 27 when a non-volatile solute (that does not dissociate) is dissolved in 54.6cm3 of benzene, vapour pressure of this solution, is found to be 98.88 mm Hg. calculate the freezing point of the solution.
Given: Enthalpy of vapourisation of benzene(l)=394.57 Jg-1. Enthalpy of fusion of benzene (l) = 10.06 kJ mol-1 Molal depression constant for benzene=5.0 K kg mol-1.
1. 177.65 K
2. 277.65 K
3. 517.65 K
4. 237.15 K