Mention the essential condition for spontaneity in a chemical reaction.

Mention two necessary conditions for doping.

What is meant by a chemical reaction?

With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

For a spontaneous endothermic reaction :

Write the name and general formula of a chain of hydrocarbons in which ar addition reaction with hydrogen can take place Stating the essential conditions required for an addition reaction to occur, write the chemical equation giving the name of the reactant and the product of such a reaction.

Complete the following chemical reaction.

The essential conditions for observing Fresnel class of diffraction is

(a) Mention the four informations given by an equation. (b) State the law of conservation of mass as applicable in a chemical reaction.

Completely the following chemical reaction.