Discussion
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- Question
The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be
Options- A. 10-11
- B. 10-10
- C. 10-3
- D. 10-4
- Correct Answer
- 10-11
- 1. 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
- 2. 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
- 3. 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
- 4. pH value of an alkaline solution is
Options- A. 7
- B. > 7
- C. < 7
- D. constant over a wide range Discuss
- 5. 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
- 6. Pick out the wrong conversion formula for the conversion of weight units :
Options- A. 1 tonne = 1000 kg = 22.046 lbs
- B. 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
- C. 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
- D. none of these Discuss
- 7. The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the
Options- A. temperature & pressure.
- B. number of intermediate chemical reactions involved.
- C. state of aggregation & the state of combination at the beginning & the end of the reaction.
- D. none of these. Discuss
- 8. The osmotic pressure of a solution increases, if its __________ is decreased.
Options- A. volume
- B. solute concentration
- C. temperature
- D. none of these Discuss
- 9. Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half, will result in __________ in the volume of the gas.
Options- A. no change
- B. doubling
- C. l/4th reduction
- D. four fold increase Discuss
- 10. Real gases approach ideal behaviour at
Options- A. high pressure & high temperature.
- B. low pressure & high temperature.
- C. high pressure & low temperature.
- D. low pressure & low temperature. Discuss
Stoichiometry problems
Search Results
Correct Answer: 19206 J
Correct Answer: In the formation of solution, chemical combination/molecular association between unlike molecules takes place.
Correct Answer: Density of dry air at N.T.P. is 1 gm/litre.
Correct Answer: > 7
Correct Answer: constitution of the solute.
Correct Answer: none of these
Correct Answer: number of intermediate chemical reactions involved.
Correct Answer: none of these
Correct Answer: doubling
Correct Answer: low pressure & high temperature.
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