Stoichiometry problems
- 1. Pick out the wrong statement.
Options- A. Raoult's law holds good for the solubility of polar gases in non-polar liquids.
- B. Molecules with symmetrical arrangement (e.g., CH4 and CCl4) are non-polar.
- C. Most of the hydrocarbons are nonpolar.
- D. Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise. Discuss
Correct Answer: Raoult's law holds good for the solubility of polar gases in non-polar liquids.
- 2. The effect of pressure on the heat capacity of the gases __________ is negligible.
Options- A. at pressure below one atmosphere
- B. below the critical temperature
- C. both(a)&(b)
- D. neither (a) nor (b) Discuss
Correct Answer: both(a)&(b)
- 3. The value of gas constant 'R' is __________ kcal/kg.mole.°C.
Options- A. 2.79
- B. 1.987
- C. 3.99
- D. none of these Discuss
Correct Answer: none of these
- 4. The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the
Options- A. phase rule
- B. experimental data
- C. emperical equations
- D. theoretical equations Discuss
Correct Answer: phase rule
- 5. The latent heat of vaporisation
Options- A. decreases with increased temperature.
- B. decreases as pressure increases
- C. becomes zero at the critical point.
- D. all (a), (b) & (c). Discuss
Correct Answer: all (a), (b) & (c).
- 6. 1 torr is equal to __________ mm Hg column.
Options- A. 1
- B. 0.1
- C. 10
- D. 1000 Discuss
Correct Answer: 1
- 7. Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is
Options- A. 80.1°C.
- B. less than 80.1°C.
- C. 100°C.
- D. greater than 80.1°C but less than 100°C. Discuss
Correct Answer: greater than 80.1°C but less than 100°C.
- 8. A bypass stream in a chemical process is useful, because it
Options- A. facilitates better control of the process.
- B. improves the conversion.
- C. increases the yield of products.
- D. none of these. Discuss
Correct Answer: facilitates better control of the process.
- 9. Validity of the relationship, inputs = outputs, holds good for the system at steady state
Options- A. with chemical reaction.
- B. without chemical reaction.
- C. without chemical reaction & losses.
- D. none of these. Discuss
Correct Answer: without chemical reaction & losses.
- 10. In physical adsorption, as compared to chemisorption, the
Options- A. quantity adsorbed per unit mass is higher.
- B. rate of adsorption is controlled by the resistance to surface reaction.
- C. activation energy is very high.
- D. heat of adsorption is very large. Discuss
Correct Answer: quantity adsorbed per unit mass is higher.
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