LPG consists of mainly

Air is a/an

Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?

Balloons are filled with

Which of the following does not contain a coinage metal?

Which metal pollute the air of a big city?

Bell metal is an alloy of

Water is a good solvent of ionic salts because:

Which of the following is not an isotope of hydrogen?

The main constituents of pearls are