Stoichiometry problems
- 1. Cp/Cv for monoatomic gases is
Options- A. 1.44
- B. 1.66
- C. 1.99
- D. 1 Discuss
Correct Answer: 1.66
- 2. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is
Options- A. H2O > C2H5OH > CS2
- B. CS2 > C2H5OH > H2O
- C. H2O > CS2 > C2H5OH
- D. CS2 > H2O > C2H5OH Discuss
Correct Answer: H2O > C2H5OH > CS2
- 3. The reverse process of fractional crystallisation is called
Options- A. stripping
- B. leaching
- C. differential distillation
- D. absorption Discuss
Correct Answer: leaching
- 4. Molality is defined as the number of gm moles of solute per __________ of solvent.
Options- A. litre
- B. kg
- C. gm mole
- D. gm Discuss
Correct Answer: kg
- 5. Saturated molal absolute humidity of the vapor-gas mixture depends upon the
Options- A. vapor pressure at dry bulb temperature
- B. total pressure
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) and (b)
- 6. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. Its units are
Options- A. m/s
- B. cm/s
- C. mole/m2.s.Pa
- D. kmole/m2.s.Pa Discuss
Correct Answer: mole/m2.s.Pa
- 7. The heat of vaporisation __________ with increase in pressure.
Options- A. increases
- B. decreases
- C. becomes zero at critical pressure
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
- 8. A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of
Options- A. 3
- B. 100
- C. 1000
- D. none of these Discuss
Correct Answer: 1000
- 9. A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.
Options- A. 283
- B. 566
- C. 293
- D. 141.5 Discuss
Correct Answer: 293
- 10. NaOH contains __________ percent oxygen.
Options- A. 1
- B. 10
- C. 16
- D. 40 Discuss
Correct Answer: 40
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