Discussion
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- Question
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
- Correct Answer
- -1632.3
- 1. Pick out the wrong unit conversion.
Options- A. 1 J = 1 W.Second = 107 ergs = 9.5 x 10-4 BTU = 0.2389 calorie
- B. 1 Watt = 746 hp
- C. -
- D. - Discuss
- 2. Atomic __________ of an element is a whole number.
Options- A. weight
- B. number
- C. volume
- D. radius Discuss
- 3. Viscosity of atmospheric air may be about __________ centipoise.
Options- A. 0.015
- B. 1.5
- C. 15
- D. 150 Discuss
- 4. Roult's law is obeyed by a __________ solution.
Options- A. saturated
- B. molar
- C. normal
- D. none of these Discuss
- 5. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 ? CO2 + 2H2O. Both the reactants and products are in gas phase. ?H°298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about
Options- A. 0.19
- B. 0.33
- C. 0.40
- D. 0.67 Discuss
- 6. pH value of H2SO4 (5% concentration) is
Options- A. 5
- B. 7
- C. > 7
- D. < 7 Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Stoichiometry problems
Search Results
Correct Answer: 1 Watt = 746 hp
Correct Answer: number
Correct Answer: 0.015
Correct Answer: none of these
Correct Answer: 0.19
Correct Answer: < 7
Correct Answer: water
Correct Answer: 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
Correct Answer: 0.65
Correct Answer: increases
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