Which is the cookings gas that we get in cylinders for domestic use?

Why is hydrogen not used as a domestic fuel?

A gas is taken in a cylinder. The walls of the cylinder is insulated from the surroundings. The gas in a cylinder is suddenly compressed. Which thermodynamic process is involved in this statement. Explain the thermodynamic process.

Which of the following artificial sweetening agent is unstable at cooking temperature :

Raju decided to construct a biogas plant in his home due to the recent hike in the cost of cooking gas. Name the bacteria involved in this process.