In the reaction 2h2o (l) + 2cl– (aq) → h2 (g) + cl2 (g) + 2oh– (aq), which substance is reduced? a. h2o b. cl c. h d. oh e. none of the above (this is not a redox reaction.)

A. H2O is the substance reduced.

H2O + 2e^(-) →H_2 + 2OH^(-)

The substance that gains electrons is reduced.  

Remember OIL RIG (Reduction Is Gain of electrons) and

LEO the lion says GER (Gain of Electrons is Reduction).