Stoichiometry problems
- 1. The pressure of 'V' litres of a dry gas is increased from 1 to 2 kgf/cm2 at a constant temperature. The new volume will become
Options- A. V/2
- B. 2V
- C. V/4
- D. V2 Discuss
Correct Answer: V/2
- 2. During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.
Options- A. enthalpy
- B. Gibbs free energy
- C. internal energy
- D. entropy Discuss
Correct Answer: Gibbs free energy
- 3. The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are
Options- A. 3.01 x 1022
- B. 6.02 x 1023
- C. 9.03 x 1024
- D. 1.20 x 1024 Discuss
Correct Answer: 9.03 x 1024
- 4. 1 Pascal (unit of pressure) is equal to __________ N/m2.
Options- A. 10
- B. 1
- C. 0.1
- D. 1000 Discuss
Correct Answer: 1
- 5. An oxidation process is accompanied by decrease in the
Options- A. number of electrons.
- B. oxidation number.
- C. number of ions.
- D. all (a), (b) & (c). Discuss
Correct Answer: number of electrons.
- 6. Colligative properties of a dilute solution are those, which depend entirely upon the
Options- A. chemical composition of the solute.
- B. constitution of the solute.
- C. number of solute molecules contained in a given volume of the solvent.
- D. none of these. Discuss
Correct Answer: constitution of the solute.
- 7. pH value of an alkaline solution is
Options- A. 7
- B. > 7
- C. < 7
- D. constant over a wide range Discuss
Correct Answer: > 7
- 8. Pick out the wrong statement.
Options- A. One kg-mole of an ideal gas occupies 22.4 m3 at N.T.P.
- B. One lb-mole of an ideal gas occupies 359 ft3 at N.T.P.
- C. One gm-mole of an ideal gas occupies 22.4 litres (i.e., 22400 c.c) at N.T.P.
- D. Density of dry air at N.T.P. is 1 gm/litre. Discuss
Correct Answer: Density of dry air at N.T.P. is 1 gm/litre.
- 9. According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.
Options- A. No component is concentrated at the surface of the solution.
- B. The component molecules are non polar and are of almost equal size.
- C. In the formation of solution, chemical combination/molecular association between unlike molecules takes place.
- D. The attractive forces between like and unlike molecules are almost equal. Discuss
Correct Answer: In the formation of solution, chemical combination/molecular association between unlike molecules takes place.
- 10. A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is
Options- A. 13728 J
- B. 19206 J
- C. 4576 J
- D. 12712 J Discuss
Correct Answer: 19206 J
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