Stoichiometry problems
- 1. Which of the following gravity scales is used exclusively for liquids heavier than water?
Options- A. Baumme scale
- B. Twaddel scale
- C. API scale
- D. none of these Discuss
Correct Answer: Twaddel scale
- 2. Dissolving a solute in a solvent does not change its
Options- A. specific heat
- B. vapour pressure
- C. viscosity
- D. none of these Discuss
Correct Answer: none of these
- 3. The crystallisation of a solute from a solution may be done by
Options- A. removal of pure solvent by evaporation.
- B. change of temperature thereby causing supersaturation.
- C. changing the nature of the system by the addition of a more soluble material.
- D. all (a), (b) &(c). Discuss
Correct Answer: all (a), (b) &(c).
- 4. A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be
Options- A. -136.5°C
- B. - 136.5°K
- C. -273°C
- D. 0°K Discuss
Correct Answer: -136.5°C
- 5. Pick out the wrong statement.
Options- A. Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong.
- B. Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state.
- C. Generally, the heat capacities of compounds are lower in the liquid than in the solid state.
- D. The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist. Discuss
Correct Answer: Generally, the heat capacities of compounds are lower in the liquid than in the solid state.
- 6. Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because
Options- A. the strong base and strong acid reacts completely.
- B. the salt formed does not hydrolyse.
- C. only OH- and H+ ions react in every case.
- D. the strong base and strong acid reacts in aqueous solution. Discuss
Correct Answer: only OH- and H+ ions react in every case.
- 7. Heat of __________ of a fuel is called its calorific value.
Options- A. formation
- B. combustion
- C. reaction
- D. vaporisation Discuss
Correct Answer: combustion
- 8. A reduction process is accompanied with increase in the
Options- A. number of electrons
- B. oxidation number
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: number of electrons
- 9. Pick out the wrong unit conversion of heat transfer rate.
Options- A. 1 kcal/hr= 1.163 Watt.
- B. 1 Watt = 1.163 kcal/hr.
- C. 1 BTU/ft2.hr = 2.712 kcal/m2.hr.
- D. 1 kcal/m2.hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m2. Discuss
Correct Answer: 1 Watt = 1.163 kcal/hr.
- 10. At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant?
Options- A. 273°C
- B. 273°K
- C. 100°C
- D. 200°C Discuss
Correct Answer: 273°C
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