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Redox Reactions Test - 1

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Redox Reactions Test - 1
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.
    In acidic medium, dichromate ion oxidizes ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 g, its gram equivalent weight is

  • Question 2
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.
    If equal volumes of 1 M KMnO4 and 1 M K2Cr2O7 solutions are allowed to oxidize Fe (II) to Fe (III) in acidic medium, then Fe (II) oxidization will be

  • Question 3
    1 / -0

    The following question has four choices out of which ONLY ONE is correct.

    Consider the following half reactions:

    Zn2+ ––>Zn(s); E0 = - 0.76V
    Cu2+ ––>Cu(s); E0 = - 0.34V

    Which of the following reactions is spontaneous?

  • Question 4
    1 / -0

    In the balanced equation H2SO4 + x HI ––>H2S + y I2 + z H2O, what are the values of x, y and z?

  • Question 5
    1 / -0

    Redox reaction between copper and aqueous solution of silver nitrate happens when copper rod is dipped in silver nitrate solution. What happens in the final stage?

    Solution

    This is due to the formation of Cu2+  ions in the solution illustrated in following ionic reaction:
    Cu(S)+2Ag+(aq)--------------˃Cu2+(aq)+2Ag(s)
    Here, Cu is oxidized to Cu2+ (means relasing of 2 electrons from Cu to Cu2+ ) and Ag+ is reduced to Ag(s) (means gaining of 2 electrons from 2Ag+ to 2Ag ) and thus, silver converted into solid state and deposited on copper rod.

  • Question 6
    1 / -0

    The mass of H2O2 that is completely oxidised with 31.2 g of KMnO4 (molar mass = 158 g mol–1) in acidic medium is

  • Question 7
    1 / -0

    The formation of sodium chloride involves two half reaction, which clearly show involvement of electrons.
    2 Na (s) → 2 Na + (g) + 2e Cl2 (g) + 2e → 2 Cl (g)
    Sum of the half reactions gives
    2 Na(s) +Cl2 (g) → 2 Na+ Cl (s) or 2 NaCl (s)

    In terms of electron-transfer change, name the oxidising agent(s) and reducing agent(s)

    Solution

    According to the modern concept, loss of electrons is oxidation whereas gain of electrons is reduction.Redox reaction involves two half reactions, one involving loss of electron or electrons (oxidation) and the other involving gain of electrons or electrons (reduction)

    • Oxidizing agent is a species which can gain one or more electrons.
    • Reducing agent is a species which can lose one or more electrons.

    In the given reaction Sodium(Na) is loosing 2 electrons, thus it is the reducing agent. Chlorine(Cl) is gaining 2 electrons , thus it is oxidising agent.

  • Question 8
    1 / -0

    HBr and HI can reduce sulphuric acid. HCl can reduce KMnO4 and HF can reduce

  • Question 9
    1 / -0

    What is the reduction product in the reaction 2KMnO4 + 16HCl ––>5Cl2 + 2MnCl2 + 2KCl + 8H2O?

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