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MCQs on Redox Reaction and Method for Balancing Redox Reaction

MCQs on Redox Reaction and Method for Balancing Redox Reaction

  1. Which of the following represents a redox reaction?
  1. NaOH + HCl → NaCl + H2O
  2. BaCl2 + H2SO4 → BaSO4 + 2HCl
  3. CuSO4 + 2H2O → Cu(OH)2 + H2SO3
  4. Zn + 2HCl → ZnCl2 + H2

Answer: (d)

  1. Which reaction involves neither oxidation nor reduction?
  1. CrO42- -→ Cr2O72-
  2. Cr → CrCl3
  3. Na → Na+
  4. 2S2O32- → S4O62-

Answer: (a)

  1. Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
  1. Zn acts as an oxidising agent when it reacts with HNO3
  2. HNO3 is a weaker acid than H2SO4 and HCl
  3. In electrochemical series, Zn is above hydrogen
  4. NO3 is reduced in preference to hydronium ion

Answer: (d)

  1. A compound of Xe and F is found to have 53.5% of Xe. What is the oxidation number of Xe in this compound?
  1. -4
  2. 0
  3. +4
  4. +6

Answer: (d)

  1. A solution contains Fe2+, Fe3+ and I ions. This solution was treated with iodine at 35oC. Eo for Fe3+/Fe2+ is 0.77V and Eo for I2/2I = 0.536V. The favourable redox reaction is
  1. I2 will be reduced to I
  2. there will be no redox reaction
  3. I will be oxidised to I2
  4. Fe2+ will be oxidised to Fe3+

Answer: (c)

  1. One mole of N2H4 loses 10 moles of electrons to form a new compound y. Assuming that all nitrogen appears in the new compound, what is the oxidation state of nitrogen in y.
  1. -1
  2. -3
  3. +3
  4. +5

Answer: (c)

  1. The equivalent mass of oxidising agent in the following reaction is

SO2 + 2H2S → 3S + 2H2O

  1. 32
  2. 64
  3. 16
  4. 8

Answer: (c)

  1. In the reaction

3Br2 + 6CO32- + 3H2O → 5Br + BrO3 + 6HCO3

  1. bromine is oxidised and carbonate is reduced
  2. bromine is reduced and water is oxidised
  3. bromine is neither reduced nor oxidised
  4. bromine is both reduced and oxidised

Answer: (d)

  1. Which of the following cannot function as an oxidising agent?
  1. I
  2. Si(s)
  3. NO3(aq)
  4. Cr2O72-

Answer: (a)

  1. The oxidation number of Pt in [Pt(C2H4)Cl3]– is
  1. +1
  2. +2
  3. +3
  4. +4

Answer: (b)

 

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