NCERT Exemplar XXII — task. Science CBSE, Class 10.

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1. Identify the reducing agent in the following reactions.

$4NH_3$ +

$5O_2$ →

$4NO$ +

$6H_2O$

A reducing agent (reductant) is a substance that reduces another substance (by removing oxygen or adding hydrogen) while also being .

$4NH_3$ +

$5O_2$ →

$4NO$ +

$6H_2O$

In the above reaction, ammonia (

$NH_3$ ) is the , because it is oxidised by oxygen (

$O_2$ ) to form nitric oxide (

$NO$ ) and water (

$H_2O$ ).

2. Identify the oxidising agent (oxidant) in the following reaction.

$Pb_3O_4$ + $8HCl$ → $3PbCl_2$ + $Cl_2$ + $4H_2O$

An oxidising agent (oxidant) is a substance that another substance (by losing electrons or removing hydrogen or adding oxygen, or increasing oxidation state) while also being reduced.

$Pb_3O_4$ +

$8HCl$ →

$3PbCl_2$ +

$Cl_2$ +

$4H_2O$

$Pb_3O_4$ is reduced to

$PbCl_2$ while

$HCl$ is to

$Cl_2$ .

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