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MCQs

Total Questions : 217 | Page 7 of 22 pages
Question 61. If acidified Potassium Dichromate(VI) (K₂Cr₂O₇) acts as oxidizing agent, color changes from
  1.    orange to red
  2.    orange to green
  3.    yellow to green
  4.    yellow to red
 Discuss Question
Answer: Option C. -> yellow to green
Answer: (c).yellow to green
Question 62. Oxidation involves
  1.    loss of hydrogen
  2.    loss of oxygen
  3.    gain in hydrogen
  4.    gain in electrons
 Discuss Question
Answer: Option A. -> loss of hydrogen
Answer: (a).loss of hydrogen
Question 63. In an acidified solution of Potassium Dichromate(VI) (K₂Cr₂O₇), Dichromate ion (Cr₂O₇-2) becomes reduced to
  1.    Chromate (V) ions
  2.    Chromium (III) ions
  3.    Chromium (II) ions
  4.    Chromium (VI) ions
 Discuss Question
Answer: Option B. -> Chromium (III) ions
Answer: (b).Chromium (III) ions
Question 64. Old paintings became discolourised due to
  1.    Lead Sulphide PbS
  2.    Lead Sulphate PbSO₄
  3.    Lead Chloride PbCl₂
  4.    Lead Oxide PbO
 Discuss Question
Answer: Option A. -> Lead Sulphide PbS
Answer: (a).Lead Sulphide PbS
Question 65. In a reaction between CuSO₄(s) and Zn(s),
  1.    Zinc experiences an increase in the oxidation state
  2.    undergoes oxidation
  3.    Zinc undergoes oxidation
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 66. Consider the reaction: SiCl₄(l) + 2H₂O(l) → SiO₂ + HCl. The color of SiO₂ is
  1.    pink precipitate
  2.    white precipitate
  3.    blue precipitate
  4.    red precipitate
 Discuss Question
Answer: Option B. -> white precipitate
Answer: (b).white precipitate
Question 67. The dimer of AlCl₃ is
  1.    Al₂Cl₃
  2.    AlCl
  3.    Al₂Cl₆
  4.    dimer of AlCl₃ does not exist
 Discuss Question
Answer: Option C. -> Al₂Cl₆
Answer: (c).Al₂Cl₆
Question 68. Consider the reaction: SiCl₄(l) + 2H₂O(l) → SiO₂(s) + HCl. The form of HCl produced in this reaction is
  1.    Liquid
  2.    solid
  3.    gas
  4.    none of above
 Discuss Question
Answer: Option C. -> gas
Answer: (c).gas
Question 69. Upon hydration of Al₂Cl₆, Al⁺³ is formed, and the solution becomes
  1.    acidic
  2.    basic
  3.    catalyst
  4.    neutral (pH: 7)
 Discuss Question
Answer: Option A. -> acidic
Answer: (a).acidic
Question 70. In period 3, metal that has the highest electronegativity is
  1.    Cl
  2.    Na
  3.    Al
  4.    S
 Discuss Question
Answer: Option A. -> Cl
Answer: (a).Cl

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