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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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For each of the following oxidation-reduction reactions, identify which element is being oxidized and which is being reduced.

a. Cl 2 ( g ) + I 2 ( g ) 2ICl ( g )    b. Cl 2 ( g ) + 2Li ( s ) 2LiCl ( s )    c. 2Na ( s ) + 2H 2 O ( l ) 2NaOH ( aq ) + H 2 ( g )    d. Cl 2 ( g ) + 2NaBr ( aq ) 2NaCl ( aq ) + Br 2 ( l )

Interpretation Introduction

Interpretation:

The oxidation-reduction reaction should be determined from the given reactions and identify the element which is being reduced and which is being oxidized.

Cl2(g)+I2(g)2ICl(g)

Cl2(g)+2Li(s)2LiCl(s)

2Na(s)+2H2O(l)2NaOH(aq)+H2(g)

Cl2(g)+2NaBr(aq)2NaCl(aq)+Br2(g).

Concept Introduction:

The chemical reaction in which both oxidation and reduction process takes place is known as redox reaction. In this reaction, transfer of electrons takes place among the elements.

Oxidation is the process in which either loss of electrons, oxidation number increases, or loss of hydrogen atoms takes place. An element is oxidized, when oxidation number increases.

Reduction is the process in which either gain of electrons, oxidation number decreases, or gain hydrogen atoms takes place. An element is reduced, when oxidation number decreases.

Oxidizing agent are those which are reduced in a chemical reaction or gain electrons whereas reducing agents are those which are oxidized in a chemical reaction or lose electrons.

Explanation

Reason for correct option:

The given reaction is:

Cl2(g)+I2(g)2ICl(g)

By comparing the oxidation states of the elements in the reactants and products, one can identify whether the given reaction is oxidation-reduction reaction or not.

Here, oxidation state of chlorine goes from 0 to -1 and oxidation of state of iodine goes from 0 to + 1. Thus, iodine is getting oxidized and chlorine is getting reduced.

Hence, the given reaction is oxidation-reduction reaction.

The given reaction is:

Cl2(g)+2Li(s)2LiCl(s)

By comparing the oxidation states of the elements in the reactants and products, one can identify whether the given reaction is oxidation-reduction reaction or not.

Here, oxidation state of chlorine goes from 0 to -1 and oxidation of state of lithium goes from 0 to + 1. Thus, lithium is getting oxidized and chlorine is getting reduced.

Hence, the given reaction is oxidation-reduction reaction

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