Reaction which takes place instantaneously is defined as

The rate of a reaction depends on 

When HCl is added to marble chips, there is a brisk effervescence which is due to the liberation of 

Substance which is capable of altering the rate of a reaction without undergoing any chemical change is called a 

Reactions in which the products cannot be reconverted into starting material is 

A white curdy precipitate obtained when silver nitrate is added to sodium chloride is

Reactions which takes place in several hours and above are known as

The catalyst used in the decomposition of H₂O₂ in

The substances obtained after the completion of a chemical change is known as

When Zinc pieces are added to hydrochloric acid, there is an evolution of a gas