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Redox Reactions Test - 2

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Redox Reactions Test - 2
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The reaction 2KCIO3 → 2KCI + 302 is

  • Question 2
    1 / -0

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

    The oxidation number of carbon in CH2O is

  • Question 3
    1 / -0

    For the reaction between KMnO4 and H2O2, the number of electrons transferred per mole of H2O2 is:

  • Question 4
    1 / -0

    Oxidation and reduction always occur simultaneously, hence, the word “redox” was coined for this class of chemical reactions. In the following redox reaction, identify the species undergoing oxidation and reduction:

    3Fe3O4(s) + 8 Al (s) → 9 Fe (s) + 4Al2O3(s)

    Solution

    In the above reaction oxygen is transferred from Fe3O4 to Al, so Fe3O4 is reduced while Al is oxidised.

    As per definition of oxidation and reduction , loss of oxygen i.e  reduction occurs in Fe3O4   and  gain of oxygen i.e Oxidation occurs in  Al.

     

  • Question 5
    1 / -0

    Oxidation number denotes the oxidation state of an element in a compound ascertained on the basis that electron in a covalent bond belong

    Solution

    Oxidation number is a number assigned to an element in a compound according to some rules. This number enable us to describe oxidation-reduction reactions, and balancing redox chemical reactions. When a covalent bond forms between two atoms with different electronegativities the shared electrons in the bond lie closer to the more electronegative atom eg. HCl

    The oxidation number of an atom is the charge that results when the electrons in a covalent bond are assigned to the more electronegative atom. It is the charge on an atom would possess if the bonding were ionic. In HCl (above) the oxidation number for the hydrogen would be +1 and that of the Cl would be -1

     

  • Question 6
    1 / -0

    The reduction potentials of A, B, C and D are 0.8 V, 0.79 V, 0.34 V and -2.37 V, respectively. Which element displaces all the other three elements?

  • Question 7
    1 / -0

    Oxygen has a positive oxidation state in

  • Question 8
    1 / -0

    In which of the following compounds does the carbon atom have zero oxidation state?

  • Question 9
    1 / -0

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

    One mole of acidified K2Cr2O7 on reaction with excess KI will liberate ___ mole(s) of I2.

  • Question 10
    1 / -0

    The electron releasing tendency of the metals, zinc, copper and silver is in the order:

    Solution

    Zinc relases electrons to copper and copper releases electron to silver therefore the electron releasing tendency of the metals, zinc, copper and silver is in the order Zn>Cu>Ag.This is on the basis of electrochemical series or metal activity series.

     

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