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?
  1.    30 c.c acid and 30 c.c base
  2.    20 c.c acid and 25 c.c base
  3.    15 c.c acid and 35 c.c base
  4.    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
  1.    Total pressure
  2.    Absolute humidity at a given temperature
  3.    Both A & B
  4.    Neither A nor B
Explanation:-
Answer: Option C. -> Both A & B
Question 3. In a neutral solution
  1.    H⁺ ions are absent
  2.    OH⁻ ions are absent
  3.    Both H⁺ and OH⁻ ions are present in very small but equal concentration
  4.    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?
  1.    Parsec
  2.    Kilo-pascal
  3.    Bar
  4.    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
  1.    17
  2.    20
  3.    25
  4.    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)
  1.    350
  2.    485
  3.    140
  4.    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.
  1.    Potential energy
  2.    Intermolecular forces
  3.    Kinetic energy
  4.    Total energy
Explanation:-
Answer: Option C. -> Kinetic energy
Question 8. The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.
  1.    9.03
  2.    3.01
  3.    1.204
  4.    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
  1.    Normality
  2.    Molarity
  3.    Molality
  4.    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 ) ?
  1.    ΔH = 1 (+ ve)and Δ V = -ve
  2.    ΔH = 0
  3.    ΔV = 0
  4.    Both B and C
Explanation:-
Answer: Option D. -> Both B and C
© Lakshya_Education.com, All Right Reserved.
Contact Us services