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REVERSIBLE AND IRREVERSIBLE REACTION MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. When talking about fire extinguishers, the acronym PASS means
  1.    Pass - Aim - Sweep - See
  2.    Push - Aid - Spray - See
  3.    Pull - Aim - Spray - Sweep
  4.    All of above
 Discuss Question
Answer: Option C. -> Pull - Aim - Spray - Sweep
Question 12. When ice melts in the sun, is that change reversible or irreversible?
  1.    reversible
  2.    irreversible
 Discuss Question
Answer: Option A. -> reversible
Question 13. What is a reversible change?
  1.    a change that can be undone or reversed
  2.    a change that CANNOT be undone or reversed
 Discuss Question
Answer: Option A. -> a change that can be undone or reversed
Question 14. What is an irreversible change?
  1.    A change that can be undone or reversed
  2.    A change that cannot be undone or reversed
 Discuss Question
Answer: Option B. -> A change that cannot be undone or reversed
Question 15. Which of the following combination is correct?
  1.    reversible ⇌irreversible →
  2.    reversible ←irreversible →
  3.    reversible ⇌irreversible ←
  4.    irreversible ⇌reversible →
 Discuss Question
Answer: Option A. -> reversible ⇌irreversible →
Question 16. Which of the following chemical reactions is reversible?
  1.    CH4 + O2 ⇌ CO2 + H2O
  2.    CuSO4.5H2O → CuSO4 + 5H2O
  3.    NH4Cl ⇌ NH3 + HCl
  4.    CaCO3 → CaO +CO2
 Discuss Question
Answer: Option C. -> NH4Cl ⇌ NH3 + HCl
Question 17. Which of the following is a sign that a chemical reaction has occurred?
  1.    change in shape
  2.    melting
  3.    formation of a gas
  4.    dissolving
 Discuss Question
Answer: Option C. -> formation of a gas
Question 18. What type of reactions can able to change products back to the their original form?
  1.    Reversible reactions
  2.    Irreversible reactions
  3.    Combustion reactions
  4.    Combination reactions
 Discuss Question
Answer: Option A. -> Reversible reactions
Question 19. What are the names of the ways a liquid changes to a gas
  1.    Evaporation
  2.    Boiling
  3.    Condensation
  4.    Both A & B
 Discuss Question
Answer: Option D. -> Both A & B
Question 20. Which is not a property of matter?
  1.    solid
  2.    liquid
  3.    gas
  4.    ice
 Discuss Question
Answer: Option D. -> ice

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