Question

Which type of reaction occurs without being started by some outside force?

Answer 1

Answer: Option (c) is the correct answer.

Explanation:

A spontaneous reaction is a reaction which occurs on its own without any intervention or outside force helping in initiation of the reaction.

A combustion reaction is the reaction in which a compound reacts with oxygen atom resulting in the formation of water and carbon dioxide gas.

A physical reaction is a reaction in which there occurs no change in chemical composition of a substance.

Activation energy is the reaction in which minimum amount of energy is required to carry out a reaction. More is the activation energy of a reaction slower will be the rate of reaction, therefore a catalyst is required to increase the rate of reaction.

Thus, we can conclude that spontaneous reaction is the type of reaction that  occurs without being started by some outside force.

Answer 2

I think it is spontaneous reaction not really sure