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JEE Main levelSingle correct optionDifficulty 2 of 3mt073

In the self-reduction $2 Cu X_{2} O + Cu X_{2} S 6 Cu + SO X_{2}$ , the reducing agent is

A $Cu X_{2} S$ , since sulphide sulphur is oxidised to $SO X_{2}$
Bthe $SO X_{2}$ formed
Ccarbon of the coke
D $Cu X_{2} O$ , since it loses oxygen

Answer: A

Sulphur goes from

- 2

in

Cu X_{2} S

to

+ 4

in

SO X_{2}

, so

Cu X_{2} S

is oxidised and acts as the reducing agent. Copper goes from

+ 1

to

0

in both compounds.

Cu X_{2} O

is the oxidising agent and no carbon is used.

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