Assertion : Most of the chemical reactions do not start automatically.
Reason : Reactant molecules have an energy barrier to become reactive.

Energy required for start of a chemical reaction is

Energy required for start of a chemical reaction is

Energy required for start of a chemical reaction is

Assertion :All molecular collisions lead to the formation of products. Reason :Reactant molecules undergo chemical change irrespective of their collision.

Assertion (A): A chemical reaction becomes faster at higher temperatures. Reason (R): At higher temperatures, molecular motion becomes more rapid.

The chemical reactions in which the reactants require high amount of activation energy are generally