Stoichiometry problems
- 1. A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to
Options- A. x1/x2
- B. x2/x1
- C. 1 - (x1/x2)
- D. 1/x2 Discuss
Correct Answer: x1/x2
- 2. Gases having same reduced temperatures and reduced pressures
Options- A. deviate from ideal gas behaviour to the same degree.
- B. have nearly the same compressibility factor.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b).
- 3. The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour
Options- A. measures the elevation in boiling point.
- B. is not dependent on the temperature.
- C. is a function of the liquid phase composition.
- D. measures the depression in freezing point. Discuss
Correct Answer: is a function of the liquid phase composition.
- 4. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
Options- A. 1/9
- B. 8/9
- C. 1/2
- D. 5/9 Discuss
Correct Answer: 8/9
- 5. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is
Options- A. 10.73 kJ
- B. 16.15 kJ
- C. 18.11 kJ
- D. 18.33 kJ Discuss
Correct Answer: 18.11 kJ
- 6. Gases diffuse faster compared to liquids because of the reason that the liquid molecules
Options- A. are held together by stronger inter-molecular forces.
- B. move faster.
- C. have no definite shape.
- D. are heavier Discuss
Correct Answer: are held together by stronger inter-molecular forces.
- 7. If pH value of a solution is 8, then its pOH value will be
Options- A. 6
- B. 1
- C. 7
- D. 10 Discuss
Correct Answer: 6
- 8. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the
Options- A. temperature.
- B. volume of solution.
- C. moles of non-volatile solute.
- D. none of these. Discuss
Correct Answer: temperature.
- 9. Vapor pressure of water at 100°C is about __________ bar.
Options- A. 0.1013
- B. 1.013
- C. 10.13
- D. 101.3 Discuss
Correct Answer: 1.013
- 10. Solutions which distil without change in composition are called
Options- A. ideal
- B. saturated
- C. supersaturated
- D. azeotropic Discuss
Correct Answer: azeotropic
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