An oxidationreduction reaction occurs when a stream of hydrogen gas is passed over hot copper(II) sulfide. Indicate

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An oxidation–reduction reaction occurs when a stream of hydrogen gas is passed over hot copper(II) sulfide. 

CuS(s) + H(g) Cu(s) + HS(g) A,

Indicate each of the following for the above redox reaction:

(a) Substance oxidized

(b) Substance reduced

(c) Oxidizing agent

(d) Reducing agent.

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