Stoichiometry problems
- 1. 6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be __________ gm.
Options- A. 0.5
- B. 1
- C. 3
- D. 5 Discuss
Correct Answer: 0.5
- 2. Pick out the wrong statement.
Options- A. The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible.
- B. The value of Cp of gases increases with increase in pressure, above atmospheric pressure.
- C. The value of Cp at critical temperature and pressure reaches infinity.
- D. all (a), (b), and (c). Discuss
Correct Answer: The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible.
- 3. Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).
Options- A. °API = 200(G - 1)
- B. °API = (141.5/G) - 131.5
- C. °API = (140/G) - 130
- D. °API = 145 - (145/G) Discuss
Correct Answer: °API = (141.5/G) - 131.5
- 4. Molar heat capacity of water in equilibrium with ice at constant pressure is
Options- A. 0
- B. ?
- C. 1
- D. none of these Discuss
Correct Answer: ?
- 5. In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the
Options- A. total pressure.
- B. absolute humidity at a given temperature.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b).
- 6. Atoms of the same element, but of different masses are called
Options- A. isobars
- B. isotones
- C. isotopes
- D. none of these Discuss
Correct Answer: isotopes
- 7. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
Options- A. same elevation in boiling point.
- B. different elevation in boiling point.
- C. elevation in boiling point in the ratio of their molecular weights.
- D. none of these. Discuss
Correct Answer: same elevation in boiling point.
- 8. With rise in pressure, the solubility of gases in solvent, at a fixed temperature
Options- A. increases
- B. decreases
- C. remains unchanged
- D. decreases linearly Discuss
Correct Answer: increases
- 9. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is
Options- A. 2
- B. 1
- C. 0.5
- D. 0.5 Discuss
Correct Answer: 0.5
- 10. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies
Options- A. XM < 0.5
- B. XM = 0.5
- C. 0.5 < XM < 0.64
- D. XM ? 0.64 Discuss
Correct Answer: XM ? 0.64
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