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REDOX REACTIONS MCQs

Total Questions : 25 | Page 3 of 3 pages
Question 21. If in a reaction, copper is reduced; its number of electrons has:
  1.    Increased
  2.    Decreased
  3.    Remained Constant
  4.    Varies Randomly
 Discuss Question
Answer: Option A. -> Increased
Question 22. Defined as the gain of electrons
  1.    oxidation
  2.    redox
  3.    reduction
  4.    LEO GER
 Discuss Question
Answer: Option C. -> reduction
Question 23. Defined as the loss of electrons
  1.    oxidation
  2.    reduction
  3.    redox
  4.    OIL RIG
 Discuss Question
Answer: Option A. -> oxidation
Question 24. What is the oxidation number of Cr in Cr2O72- ?
  1.    +14
  2.    +6
  3.    -6
  4.    -14
 Discuss Question
Answer: Option B. -> +6
Question 25. What is the oxidizing agent of this reaction?2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
  1.    H2
  2.    Al3+
  3.    Al
  4.    H+
 Discuss Question
Answer: Option D. -> H+

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