Give reason for: While cutting onions our tears start flowing.

Give the reason for bleaching action of Cl_(2) ?

Give example for cuttings.

Give reason for the need of classification of element .

Give reasons for the diagonal relationship observed in the periodic table .

Give an exmaple for vestigial organ in our body.

A person is injured while playing on the ground. Blood is flowing continuously. What might be the reasons?

Give the sequence of reactions to prepare 2-butanol starting from 1-butene.

Give reasons for the following : Silver is used in making mirrors.