Stoichiometry(Engineering > Chemical Engineering ) Questions and Answers

Question 1. 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 2. 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 3. 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 4. 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 5. 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 6. NaOH contains __________ percent oxygen.
  1.    1
  2.    10
  3.    16
  4.    40
Explanation:-
Answer: Option D. -> 40
Question 7. Increasing the temperature of an aqueous solution will cause decrease in its
  1.    Molality
  2.    Mole fraction
  3.    Weight percent
  4.    Molarity
Explanation:-
Answer: Option D. -> Molarity
Question 8. The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is __________ kg mole.
  1.    1
  2.    0
  3.    16
  4.    44
Explanation:-
Answer: Option B. -> 0
Question 9. The value of gas constant 'R' is __________ kcal/kg.mole.°C.
  1.    2.79
  2.    1.987
  3.    3.99
  4.    None of these
Explanation:-
Answer: Option D. -> None of these
Question 10. Heat of __________ of a fuel is called its calorific value.
  1.    Formation
  2.    Combustion
  3.    Reaction
  4.    Vaporisation
Explanation:-
Answer: Option B. -> Combustion
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