Reaction in which hydrogen is added to a substance is called ______ reaction.
Reaction in which hydrogen is added to a substance is called reduction reaction.
The reaction in which hydrogen is added to substance and oxygen is removed from substance, is called __ reaction.
The reaction in which oxygen is added to a substance or hydrogen is removed from a substance, is called oxidation reaction.
The reaction in which oxygen is added to the substance is called _______ reaction.