Stoichiometry(Chemical Engineering ) Questions and Answers
Question 1. In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest?
30 c.c acid and 30 c.c base
20 c.c acid and 25 c.c base
15 c.c acid and 35 c.c base
35 c.c acid and 15 c.c base
Explanation:-
Answer: Option A. -> 30 c.c acid and 30 c.c base
Question 2. In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the
Total pressure
Absolute humidity at a given temperature
Both A & B
Neither A nor B
Explanation:-
Answer: Option C. -> Both A & B
Question 3. In a neutral solution
H⁺ ions are absent
OH⁻ ions are absent
Both H⁺ and OH⁻ ions are present in very small but equal concentration
None of these
Explanation:-
Answer: Option C. -> Both H⁺ and OH⁻ ions are present in very small but equal concentration
Question 4. Which of the following is not a unit of pressure?
Parsec
Kilo-pascal
Bar
Newton/metre²
Explanation:-
Answer: Option A. -> Parsec
Question 5. A vessel of volume 1000 m³ contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately
17
20
25
34
Explanation:-
Answer: Option A. -> 17
Question 6. A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)
350
485
140
345
Explanation:-
Answer: Option A. -> 350
Question 7. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.
Potential energy
Intermolecular forces
Kinetic energy
Total energy
Explanation:-
Answer: Option C. -> Kinetic energy
Question 8. The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.
9.03
3.01
1.204
6.02
Explanation:-
Answer: Option A. -> 9.03
Question 9. Number of gm moles of solute dissolved in 1 kg of solvent is called its
Normality
Molarity
Molality
Formality
Explanation:-
Answer: Option C. -> Molality
Question 10. Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?