Galvanising means covering iron with a thin coat of A. Tin B. Zinc C. Glaze D. Coal tar

The correct answer is B. Galvanizing means covering iron with a thin coat of zinc. This is done to protect the iron from rust and corrosion. Zinc is a more reactive metal than iron, so it will corrode instead of the iron. This process is called sacrificial protection.

Tin is also a metal that can be used to galvanize iron, but it is not as common as zinc. Glaze is a type of glass that is used to coat pottery and other objects. Coal tar is a thick, black liquid that is produced when coal is burned. It is used to make a variety of products, including roofing materials, asphalt, and creosote.