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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

In the reaction

CuFeS 2 (s) +  3 CuCl 2 (aq)   4 CuCl(s) + FeCl 2 (aq) +  2 S(s)

what element is oxidized and what element is reduced?

(a) Sulfur is reduced, iron is oxidized.

(b) Copper is reduced, sulfur is oxidized.

(c) Sulfur is reduced, copper is oxidized.

(d) This is not a redox reaction.

Interpretation Introduction

Interpretation: The element which has oxidized and reduced in the given reaction has to be determined.

Concept introduction:

Redox reaction: It occurs when oxidation and reduction takes place at the same time in a chemical reaction.

Oxidation: If electrons are moved from a species during a chemical reaction. The species whose electrons are removed is said to be oxidized.

Reduction: If electrons are gained to a species during a chemical reaction. The species which gets electrons are said to be reduced.

Explanation

Reason for correct option:

In the given reaction, it is found that copper is reduced, sulfur is oxidized.

The balanced chemical equation for the reaction is,

  CuFeS2(s)+3CuCl2(aq)4CuCl(s)+FeCl2(aq)+2S(s)

The sulfide ions in copper sulfide are oxidized by iron ions. Also iron reduces copper

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