Question

what do you understand by rate of reaction​

Answer 1

Answer:

Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time

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Answer 2

Answer:

for every action there will be an opposite reaction.

so here reaction is compulsory needs.