Stoichiometry problems
- 1. 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 Discuss
Correct Answer: 16
- 2. 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
Correct Answer: unpredictable.
- 3. 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
Correct Answer: vapor pressure lowering
- 4. 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
Correct Answer: 1 kcal/m2.hr.°K = 1.163 W/m2.°C
- 5. 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
Correct Answer: 0.065
- 6. 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
Correct Answer: P/3
- 7. __________ kg of CaC03 on heating will give 56 kg of CaO.
Options- A. 56 .
- B. 100
- C. 144
- D. 1000 Discuss
Correct Answer: 100
- 8. Kopp's rule is helpful in finding the
Options- A. heat capacities of solids.
- B. heat capacities of gases.
- C. molal heat capacities of gases.
- D. activation energy. Discuss
Correct Answer: heat capacities of solids.
- 9. Cp is expressed in S.I. unit as
Options- A. J/kg.°K
- B. 0°K
- C. W/m2. °C
- D. W/m. °K Discuss
Correct Answer: J/kg.°K
- 10. 'Giga' stands for
Options- A. 109
- B. 10-12
- C. 1012
- D. 1015 Discuss
Correct Answer: 109
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