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- Question
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.
- Correct Answer
- number of intermediate chemical reactions involved.
- 1. 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
- 2. 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 Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. The osmotic pressure of a solution increases, if its __________ is decreased.
Options- A. volume
- B. solute concentration
- C. temperature
- D. none of these Discuss
- 7. 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
- 8. 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
- 9. Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at
Options- A. heat conservation.
- B. yield enhancement.
- C. product enrichment.
- D. none of these. Discuss
- 10. The vapor pressure of liquids (having similar chemical nature) at any specified temperature __________ with increasing molecular weight.
Options- A. increases
- B. decreases
- C. remains unchanged
- D. increases linearly Discuss
Stoichiometry problems
Search Results
Correct Answer: none of these
Correct Answer: 10-11
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: none of these
Correct Answer: doubling
Correct Answer: low pressure & high temperature.
Correct Answer: product enrichment.
Correct Answer: decreases
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