Stoichiometry problems
- 1. 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
Correct Answer: 10-11
- 2. 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
Correct Answer: none of these
- 3. 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
Correct Answer: number of intermediate chemical reactions involved.
- 4. The osmotic pressure of a solution increases, if its __________ is decreased.
Options- A. volume
- B. solute concentration
- C. temperature
- D. none of these Discuss
Correct Answer: none of these
- 5. 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
Correct Answer: doubling
- 6. 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
Correct Answer: low pressure & high temperature.
- 7. 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
Correct Answer: product enrichment.
- 8. 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
Correct Answer: decreases
- 9. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is
Options- A. 1/2
- B. 1/3
- C. 1/4
- D. 2/3 Discuss
Correct Answer: 1/3
- 10. The temperature at which the second Virial co-efficient of a real gas is zero is called the
Options- A. eutectic point
- B. Boyle temperature
- C. boiling point
- D. critical temperature Discuss
Correct Answer: eutectic point
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