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- Question
Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume 'X' diffuses twice as fast as another perfume 'Y'; what is the molecular weight of 'Y', if the vapor density of gas 'X' is 2? Molecular weight of gas 'X' is to be assumed to be 2.
Options- A. 2
- B. 4
- C. 8
- D. 16
- Correct Answer
- 16
- 1. Pick out the wrong unit conversion of mass transfer co-efficient.
Options- A. 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar
- B. 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar
- C. 1 lb/hr . ft2 = 4.8823 kg/hr . m2
- D. 1 kg/hr . m2 = 4.8823 lb/hr . ft2 Discuss
- 2. Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ?H = heat of mixing, and ?V = volume change on mixing )?
Options- A. ?H = 1 (+ ve)and ? V = -ve
- B. ?H = 0
- C. ?V = 0
- D. both (b) and (c) Discuss
- 3. Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 ? N2 + 3H2, is equal to __________ kJ/kg. mole.
Options- A. 46
- B. 92
- C. -23
- D. -92 Discuss
- 4. Ideal solution is formed, when its components have zero
Options- A. heat of mixing.
- B. volume change.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 5. The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is
Options- A. 0.4
- B. 0.6
- C. 0.8
- D. 0.2 Discuss
- 6. The temperature of a gas in a closed container is 27° C. If the temperature of the gas is incresed to 300° C, then the pressure exerted is
Options- A. doubled.
- B. halved.
- C. trebled.
- D. unpredictable. Discuss
- 7. Addition of a non-volatile solute to a solvent produces a __________ in its solvent.
Options- A. freezing point elevation
- B. boiling point depression
- C. vapor pressure lowering
- D. all (a), (b) & (c) Discuss
- 8. Pick out the wrong unit conversion of heat transfer co-efficient.
Options- A. 1 kcal/m2.hr.°C = 0.2048 BTU/ft2.hr. °F. = 1.163 W/m2.°K
- B. 1 kcal/m2.hr.°K = 1.163 W/m2.°C
- C. 1 W/m2 . °C = 0.1761 BTU/ft2.hr.°F.
- D. 1 BTU/ft2.hr.°F = 4.88 kcal/m2.hr.°C = 20.44 kJ/m2.hr°C = 5.678 W/m2.°C. Discuss
- 9. One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The amount of water vapour condensed (in kg) is
Options- A. 0.0
- B. 0.065
- C. 0.1
- D. 1.0 Discuss
- 10. For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become
Options- A. P/3
- B. 3P
- C. 9P2
- D. 9P Discuss
Stoichiometry problems
Search Results
Correct Answer: 1 kg/hr . m2 = 4.8823 lb/hr . ft2
Correct Answer: both (b) and (c)
Correct Answer: 92
Correct Answer: both (a) & (b).
Correct Answer: 0.6
Correct Answer: unpredictable.
Correct Answer: vapor pressure lowering
Correct Answer: 1 kcal/m2.hr.°K = 1.163 W/m2.°C
Correct Answer: 0.065
Correct Answer: P/3
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