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Redox Reactions

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Q. In a redox reaction, what happens to the oxidation state of the reducing agent?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Varies
Q. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, what is being reduced?
  • A. Fe2O3
  • B. C
  • C. Fe
  • D. CO2
Q. In the reaction Zn + Cu^2+ → Zn^2+ + Cu, which element is oxidized?
  • A. Zn
  • B. Cu^2+
  • C. Zn^2+
  • D. None
Q. What is the final product of the complete reduction of permanganate ion (MnO4-) in acidic medium?
  • A. MnO2
  • B. MnO4^2-
  • C. Mn^2+
  • D. MnO3
Q. What is the oxidation state of nitrogen in NH4+?
  • A. -3
  • B. 0
  • C. +1
  • D. +3
Q. What is the oxidation state of sulfur in H2SO4?
  • A. +6
  • B. +4
  • C. +2
  • D. 0
Q. What is the product of the reduction of Cr2O7^2- in acidic solution?
  • A. CrO4^2-
  • B. Cr^3+
  • C. CrO3
  • D. CrO2
Q. Which of the following is a common oxidizing agent?
  • A. H2
  • B. Cl2
  • C. Na
  • D. Fe
Q. Which of the following is a reducing agent in the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O?
  • A. MnO4-
  • B. C2O4^2-
  • C. H+
  • D. CO2
Q. Which of the following species is oxidized in the reaction 2H2 + O2 → 2H2O?
  • A. H2
  • B. O2
  • C. H2O
  • D. None
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