Lakhmir Singh Solutions Class 10 Chemistry Solutions for Exercise in Chapter 1 - Chapter 1 Chemical Reactions and Equations

Question 23 Exercise

(a) Define the following in terms of gain or loss of hydrogen with one example each:

(i) Oxidation (ii) reduction


(a) Oxidation is the removal of hydrogen and reduction is the gaining of hydrogen.

(i) H2S + Cl2 \Rightarrow S + 2HCl

In this reaction, H2S is changing into S. This means Hydrogen is being removed from hydrogen sulphide. Now, by definition, the removal of hydrogen from a compound is called oxidation. So, hydrogen sulphide is being oxidized to sulphur.

(ii) 2NH3 + 3Br2 = N2 + 6HBr

Here, Br2 is changing into HBr. That is, hydrogen is being added to bromine. By definition, the addition of hydrogen to a substance is called reduction, so we can say that bromine is being reduced to hydrogen bromide.

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