1.

Name one example of reaction in which dihydrogen acts (i) as an oxidizing agent (ii) as a reducing agent.

Answer»

(i) In the reaction of dihydrogen with metals to form metal hydride it acts as an oxidizing agent 

2Na(s) +H2 (g) --------------> 2Na+H

Here Na has oxidized to Na+ and Dihydrogen is reduced to hydride (H- ) ion 

(ii) In the reaction of heated cupric oxide with dihydrogen to form H2O and copper metal dihydrogen acts as a reducing agent 

CuO(s) +H2 (g) ------------> Cu(s) +H2O



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