Mutual exchange of elements or radicals by two substances is known as

When one element or radical replaces another element or radical in a substance, it is called

Decomposition of calcium carbonate liberates

Decomposition of PCl₅ is 

On burning Sulphur with oxygen, Sulphur dioxide is formed, It is an example for

Reaction of Zinc on Copper sulphate is an example for

Metal reacts with hydrogen to form

When a single substance split into 2 or more substances, the reaction is called

Nitrogen and hydrogen combines to form 

On heating lead nitrate, a pale yellow substance left is