Question

write any two chemical reaction in which water act as a reducing and oxidizing agent respectively

Answer 1

1. CuO + H2 - Cu + H2o
in this reaction water combine with hydrogen and leaves copper so it is an oxidising agent
And
when oxygen leaves copper so it is an reducing agent

Answer 2

CuO+H2--->Cu+H2O
MnO+4HCl---->MnCl2+2H2O+Cl