Give an example to show that the product of two non-zero matrices is a zero matrix.

Give examples to show that : AB=BA

Prove that the intersection of two equivalence relations in a set is an equivalence relation and give an example to show that the union of two equivalence relations in a set is not necessarily an equivalence relation.

Give two examples of hypnotic

Give examples to show that : A^2=I , where A ne I

Give two example of state function..

Give two examples of contact force.

Give two example of amphoteric oxide.