Stoichiometry problems
- 1. The heat evolved in the combustion of benzene is represented by the equation:
C6H6 + 7.5 O2 = 6CO2 + 3H2O, ?H = 3264.6 kJ/kg. mole
The heat energy change, when 39 gm of C6H6 is burnt in an open container, will be __________ kJ/kgmole.
Options- A. +816.15
- B. +1632.3
- C. -1632.3
- D. -2448.45 Discuss
Correct Answer: -1632.3
- 2. pH value of H2SO4 (5% concentration) is
Options- A. 5
- B. 7
- C. > 7
- D. < 7 Discuss
Correct Answer: < 7
- 3. Viscosity of 1 centipoise is equal to 1 centis-toke in case of
Options- A. water
- B. mercury
- C. carbon tetrachloride
- D. none of these Discuss
Correct Answer: water
- 4. Pick out the wrong unit conversion of thermal conductivity.
Options- A. 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2. hr.°C/m
- B. 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
- C. 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
- D. 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F Discuss
Correct Answer: 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
- 5. The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4 will be __________ gm.
Options- A. 0.065
- B. 0.65
- C. 6.5
- D. 65 Discuss
Correct Answer: 0.65
- 6. At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature.
Options- A. increases
- B. decreases
- C. remains unchanged
- D. increases linearly Discuss
Correct Answer: increases
- 7. Pick out the wrong statement about the recycle stream in a process.
Options- A. Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants.
- B. The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio.
- C. Recycling in a process does not help in getting higher extent of reaction.
- D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column. Discuss
Correct Answer: Recycling in a process does not help in getting higher extent of reaction.
- 8. The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the
Options- A. nature of both the gas & the liquid.
- B. temperature.
- C. total pressure.
- D. none of these. Discuss
Correct Answer: none of these.
- 9. A saturated vapor on being compressed would
Options- A. condense
- B. form wet steam
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 10. Dry air is a mixture of
Options- A. vapors
- B. gases
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: gases
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