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MCQs

Total Questions : 217 | Page 4 of 22 pages
Question 31. Hydrated iron (III) is called
  1.    oxide
  2.    rust
  3.    reducing agent
  4.    hydroxide
 Discuss Question
Answer: Option B. -> rust
Answer: (b).rust
Question 32. In the process of oxidation, 20% of iron and steel is destroyed because of
  1.    rusting
  2.    molting
  3.    global warming
  4.    none of above
 Discuss Question
Answer: Option A. -> rusting
Answer: (a).rusting
Question 33. Percentage of Fe⁺² can be determined by
  1.    magnate ion
  2.    ferrous ion
  3.    steel ion
  4.    bronze ion
 Discuss Question
Answer: Option A. -> magnate ion
Answer: (a).magnate ion
Question 34. To determine that a substance is oxidized or reduced other factor to consider is
  1.    electron transfer only
  2.    changes in oxidation number only
  3.    proton transfer
  4.    electron transfer and changes in oxidation number
 Discuss Question
Answer: Option D. -> electron transfer and changes in oxidation number
Answer: (d).electron transfer and changes in oxidation number
Question 35. The reactions which cost a lot of money are the ones which are
  1.    oxidation reaction
  2.    reduction reaction
  3.    redox reaction
  4.    condensation reaction
 Discuss Question
Answer: Option A. -> oxidation reaction
Answer: (a).oxidation reaction
Question 36. The oxidation number of chromium in K₂Cr₂O₇
  1.    6
  2.    11
  3.    9
  4.    14
 Discuss Question
Answer: Option A. -> 6
Answer: (a).6
Question 37. In KMnO₄, oxidation state of Mn is
  1.    4
  2.    5
  3.    6
  4.    7
 Discuss Question
Answer: Option D. -> 7
Answer: (d).7
Question 38. The apparent charge on an atom of an element in a molecule or an ion is called
  1.    Atomic number
  2.    Mass number
  3.    Oxidation number
  4.    None of above
 Discuss Question
Answer: Option C. -> Oxidation number
Answer: (c).Oxidation number
Question 39. In the reaction 2Fe + 3Cl₂ → 2FeCl₃
  1.    Cl₂ is oxidized
  2.    Fe is reduced
  3.    Fe is oxidized
  4.    Cl₂ is reduced
 Discuss Question
Answer: Option C. -> Fe is oxidized
Answer: (c).Fe is oxidized
Question 40. Elements in free state have oxidation state
  1.    0
  2.    1
  3.    2
  4.    3
 Discuss Question
Answer: Option A. -> 0
Answer: (a).0

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