Which of the following has been reelected as the

Which of the following substances are ozone-depleting?

Select the correct answer from the code given below.

Which of the following is NOT a base?

Which of the following elements is a noble gas?

What is the boiling point of water at sea level.

What happens when camphor is heated?  

Which of the following glass absorbs ultraviolet rays which are harmful for the eyes?

Which vitamin exists  in the Cobalt   ?

Which element is used for making of lead of a pencil?

Which gas is most abundant in the Earth's atmosphere?

Which of the following gas is used to fill balloons.