Which acid is used in car Battery?

The correct answer is Sulfuric acid.

Key Points

• The acid used in a car battery is Sulfuric acid.
• Battery acid is sulfuric acid that has been diluted with water to attain a 37% concentration level.
• Car or automotive battery acid is 30-50% sulfuric acid (H2SO4) in water.

Important Points 

• A lead-acid battery consists of two lead plates separated by a liquid or gel containing sulfuric acid in water.
• The working of the lead-acid battery involves the formation of lead sulphate by oxidation of lead at the anode and reduction of lead dioxide at the cathode.
• During battery charge, the lead sulphate is converted back to lead and lead dioxide, releasing sulphuric acid into the electrolyte.
• As sulphuric acid is consumed during the discharge process and released during the charging process. 
• The specific gravity of the electrolyte changes during battery use and charge.

Additional Information

• HCl use as cleaners such as toilet bowl cleaners, bathroom tile cleaners and other porcelain cleaners.
• HNO3 used in woodworking, rocket propulsion, metal finishing, and sanitizing.
• H2CO3 (Carbonic acid) is widely used in making bubbly, fizzy drinks