Question

a reaction in which a substance combines with hydrogen is callled as _

1) endothermic reaction
2)exothermic reaction
3)oxidation reaction
4)reduction reaction.​

Answer 1

Answer:

reduction reaction pls follow me I'll follow back you

Answer 2

Answer:

Reduction reaction

Explanation:

This is because none of the other options are correct

An endothermic reaction consumes heat for the endproduct to be produced

An exothermic reaction gives off heat and light in presence of oxygen

An oxidation reaction add the oxygen element in the reaction

A reduction reaction allows hydrogen to add and oxygen us removed

Hence the ans is option 4!