Identify the oxidising agent, reducing agent and the substance undergoing oxidation and reduction in the following reactions:
$bold space bold space bold left parenthesis bold a bold right parenthesis bold space bold H subscript bold 2 bold SO subscript bold 4 bold space bold plus bold space bold 2 bold HBr bold space bold space bold rightwards arrow bold space bold space bold space bold space bold SO subscript bold 2 bold space bold plus bold space bold Br subscript bold 2 bold space bold plus bold space bold 2 bold H subscript bold 2 bold O bold space bold space bold left parenthesis bold b bold right parenthesis bold space bold 3 bold CuO bold space bold plus bold space bold 2 bold NH subscript bold 3 bold space bold space bold rightwards arrow bold space bold space bold space bold space bold 3 bold Cu bold space bold plus bold space bold N subscript bold 2 bold space bold plus bold space bold 2 bold H subscript bold 2 bold O$

(i) Oxidising agent H₂SO₄(ii) Reducing agent HBr
(iii) Substance oxidised HBr
(iv) Substance reduced H₂SO₄

(i) Oxidising agent CuO
(ii) Reducing agent NH₃(iii) Substance oxidised NH₃
(iv) Substance reduced CuO.

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