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Redox Reactions

Question
CBSEENCH11006713

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

Solution

a) 

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

 b)

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