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Question

Reduction involves 


  1. Addition of Hydrogen

  2. Addition of any electropositive element

  3. Removal of oxygen

  4. Removal of any electronegative element


Solution

The correct options are
A

Addition of Hydrogen


B

Addition of any electropositive element


C

Removal of oxygen


D

Removal of any electronegative element



Reduction is the process of addition of hydrogen or hydrogen or any electropositive element or group or removal of oxygen or any electronegative element or group. For example:
a. H2(g)+Cl2(g)[R]2HCl(g)
    (Addition of hydrogen)
b. 2HgCl2(aq)+SnCl2(aq)[R]Hg2Cl2(s)+SnCl4(aq)
    
    (Addition of electropositive element)
c. ZnO(s)+C(s)[R]Zn(s)+CO(g)
    (Removal of oxygen)
d. 2FeCl3(aq)+H2S(g)[R]
    FeCl2(aq)+2HCl(aq)+S(s)
    (Removal of an electronegative element)
A more general definition is:
Reduction: It is a process in which an atom or a group of atoms taking part in a chemical reaction gains one or more electrons.

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