Lakshya Education MCQs

Question: During a reversible isothermal expansion of an ideal gas, the entropy change is
Options:
A.+ve
B.0
C.-ve
D.
Answer: Option A

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Question 1. Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is
  1.    1
  2.    4
  3.    2
  4.    3
Answer: Option C
Question 2. Which of the following is not affected by temperature changes?
  1.    Fugacity
  2.    Activity co-efficient
  3.    Free energy
  4.    None of these
Answer: Option D
Question 3. Forward reaction will be favoured for the exothermic reaction, represented by CO + H₂O ⇋ CO₂ + H₂, by
  1.    Low temperature and high pressure
  2.    Low temperature and low pressure
  3.    High temperature and high pressure
  4.    High temperature and low pressure
Answer: Option A
Question 4. When a gas in a vessel expands, its internal energy decreases. The process involved is
  1.    Reversible
  2.    Irreversible
  3.    Isothermal
  4.    Adiabatic
Answer: Option A
Question 5. Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are
  1.    Always greater than one
  2.    Same at the same reduced temperature
  3.    Same at the same reduced pressure
  4.    Both B & C
Answer: Option D
Question 6. The unit of equilibrium constant of a chemical reaction is the same as that of
  1.    Molar concentration
  2.    Temperature
  3.    Internal energy
  4.    None of these
Answer: Option D

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