The correct answer is liquid.

Cooking Gas:

• Cooking gas is also called LPG (Liquified Petroleum Gas).
• Liquefied petroleum gas (LPG) is a colourless odourless liquid which readily evaporates into a gas. 
• LPG (cooking gas) is a mixture of  Butane and propane.
• LPG (cooking gas) is a flammable mixture of hydrocarbon gases that include propane, butane, isobutene, and mixtures of the three LPG gases.
• On liquefaction, petroleum gas changes into a liquid which is called liquefied Petroleum Gas (LPG).
• The main constituent of LPG is butane though it contains smaller amounts of ethane and propane also.
• LPG (cooking gas) is stored in steel vessels ranging from small BBQ gas bottles to larger gas cylinders and tanks.
• When a valve provided in the cylinder is opened with the help of a regulator; due to a decrease in pressure, LPG changes into a vapour.
• This vapour flows to the burners through a rubber tubing attached to the regulator.
• They are commonly used for generating heat for the home.
• For example- heating, hot water, cooking including boilers, etc.

Advantages of LPG:

1. It is a high calorific value fuel (50 kJ/g).
2. It bums without smoke and is pollutionless.
3. It is a neat and clean fuel.
4. It is convenient to store.