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- Question
The combustion equations of carbon and carbon monoxide are as follows:
C + O2 = CO2, ?H = - 394 kJ/kg . mole CO + 1/2 O2 = CO2, ?H = - 284.5 kJ/kg. mole.
The heat of formation of CO is __________ kJ/kg. mole.
Options- A. -109.5
- B. +109.5
- C. +180
- D. +100
- Correct Answer
- -109.5
- 1. The value of Trouton's ratio (?b/Tb) for a number of substances is 21 (where, ?b = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids.
Options- A. polar
- B. non-polar
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 2. For a neutral solution (pH = 7), the value of[H+] [OH-] is equal to
Options- A. 0
- B. 1
- C. < 1
- D. > 1 Discuss
- 3. The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.
Options- A. less
- B. more
- C. same
- D. either (a) or (b); depends on the nature of the substance Discuss
- 4. Recycling in a chemical process facilitates
Options- A. increased yield
- B. enrichment of product
- C. heat conservation
- D. all (a), (b) &(c) Discuss
- 5. The value of the gas-law constant 'R' is 1.987
Options- A. kcal/kg-mole.°C
- B. Btu/lb-mole.°R
- C. kcal/kg-mole.°K
- D. both (b)& (c) Discuss
- 6. For any system, the __________ heat of solution is dependent on the temperature and the adsorbate concentration.
Options- A. integral
- B. differential
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 7. The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the
Options- A. equal sized reactors are the best.
- B. smaller reactor should come first.
- C. larger reactor should come first.
- D. none of these. Discuss
- 8.
for fully open gate valves would be
Options- A. much more than that for fully open globe valves.
- B. much less (say 2% than that for fully open globe valves).
- C. around 7.
- D. both (b) and (c). Discuss
- 9. Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method
Options- A. is more accurate in finding the number of equilibrium stages.
- B. accounts for the enthalpy changes in the process.
- C. facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method.
- D. all 'a', 'b' & 'c'. Discuss
- 10. Generally, elliptical dished heads
Options- A. are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m2 .
- B. resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter.
- C. are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D.
- D. all (a), (b) and (c) Discuss
Stoichiometry problems
Search Results
Correct Answer: both (a) & (b)
Correct Answer: 1
Correct Answer: same
Correct Answer: all (a), (b) &(c)
Correct Answer: both (b)& (c)
Correct Answer: both (a) & (b)
Correct Answer: smaller reactor should come first.
Correct Answer: both (b) and (c).
Correct Answer: all 'a', 'b' & 'c'.
Correct Answer: all (a), (b) and (c)
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