Which gas is mainly present in cow dung gas?

Which gas is used to extinguish fire?

Which one of the following gases produces a red light when electricity flows through it?

Which of the following gases is used in electric bulbs?

The heat released at the time of condensation is called as

How can one state of matter be changed into another?

What is the lowermost layer of the earth?

Which of the following element is not a gas?

Which of the following is a rare radioactive gas?

Changing from Solid state to the gaseous state is known as