What is the full form of LPG?

The correct answer is option 3. Liquified Petroleum Gas.

LPG (Liquified Petroleum Gas) is a flammable hydrocarbon gas that is commonly used as fuel in heating appliances, cooking equipment, and vehicles. Here's an explanation of the full form:

1. Liquified: LPG is in a liquified state under moderate pressure, which allows for its storage and transportation in containers. The liquification process involves cooling the gas to a temperature at which it becomes a liquid.

2. Petroleum: LPG is derived from petroleum, which is a fossil fuel. It is a mixture of hydrocarbons, primarily propane and butane, and is obtained as a byproduct during the refining of crude oil or the extraction of natural gas.

3. Gas: Although LPG is liquified for storage and transportation, it vaporizes back into a gas when released from its pressurized container. This gaseous state is what allows LPG to be burned as a fuel.