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Question

Which of the following statements about the reaction is/are correct?


2AuCl4+3Zn2Au+3Zn2++8Cl

A
AuCl4 is reduced to Au
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B
Zn is oxidised to Zn2+
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C
Cl is a spectator ion
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D
It is an intermolecular redox reaction
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Solution

The correct options are
A AuCl4 is reduced to Au
B Zn is oxidised to Zn2+
C Cl is a spectator ion
D It is an intermolecular redox reaction
As in AuCl4, Au has +3 oxidation state which changes to 0 (zero). Hence, it is getting reduced.

Zn is in zero oxidation state which changes to +2 in Zn2+. Hence, it is getting oxidized.

A spectator ion is an ion that exists in the same form on both the reactant and product sides of a chemical reaction.
It means that the oxidation state of Cl ion does not change as it remains the same, i.e. -1.

AuCl4 and Zn is undergoing redox reaction in which Au is reduced and Zn is oxidised. Hence, it is an intermolecular redox reaction.

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