What is the chemical composition of Red Lead? 

Atomic weight of an element is compared with which of the following to get the atomic weight of that element? 

Which of the following is the largest living bird? 

Acid rain is mainly a mixture of—

Which one among the following nontoxic gases helps in formation of enzymes which ripen fruit?

The metal always found in free state is__

The ozone layer in the atmosphere is at a height of about

For control of which disease is an antigen ( D, P, T ) administered to children?