Stoichiometry problems
- 1. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies
Options- A. 0 < Xw < 0.5
- B. Xw = 0.5
- C. 0.5 < Xw < 1.0
- D. Xw = 1.0 Discuss
Correct Answer: 0.5 < Xw < 1.0
- 2. N.T.P. corresponds to
Options- A. 1 atm.absolute pressure& 0°C.
- B. 760 mm Hg gauge pressure & 0°C.
- C. 760 torr & 15°C.
- D. 101.325 KPa gauge pressure & 0°C. Discuss
Correct Answer: 1 atm.absolute pressure& 0°C.
- 3. The vapor pressure of liquids of similar chemical nature at any particular temperature __________ with increase in the molecular weight.
Options- A. increases
- B. decreases
- C. remains unchanged
- D. either (a) or (b); depends on the liquid Discuss
Correct Answer: decreases
- 4. For a reacation, X ? Y, if the concentration of 'X' is tripled; the rate becomes nine times. The order of reaction is
Options- A. 0
- B. 1
- C. 2
- D. 3 Discuss
Correct Answer: 2
- 5. The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of
Options- A. normal condensation.
- B. wetting.
- C. sum of (a) and (b).
- D. difference of (a) and (b). Discuss
Correct Answer: sum of (a) and (b).
- 6. 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?
Options- A. 5
- B. 10
- C. 15
- D. 20 Discuss
Correct Answer: 10
- 7. Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches
Options- A. ?
- B. 0
- C. 1
- D. 0.24 Discuss
Correct Answer: 1
- 8. At standard conditions,
N2 + 2O2 ⇌ 2NO2; ?G° = 100 kJ/mole
NO +
O2 ⇌ 2NO2; ?G° = -35 kJ/mole
The standard free energy of formation of NO in kJ/mole is
Options- A. 15
- B. 30
- C. 85
- D. 170 Discuss
Correct Answer: 85
- 9. A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct?
Options- A. Xc > Xs
- B. Xc = Xs .
- C. Xc < Xs
- D. Xc greater/less than Xs depending on the length of the cylinder Discuss
Correct Answer: Xc < Xs
- 10. Cp equals Cv at
Options- A. 0°C
- B. 0°K
- C. 0°F
- D. 0°R Discuss
Correct Answer: 0°K
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