Which of the following is also used as a lubricant? A. Cuprite B. Graphite C. Haematite D. Cryolite

The correct answer is B. Graphite.

Graphite is a form of carbon that is used as a lubricant because it is soft and has a low coefficient of friction. It is also used in pencils, batteries, and nuclear reactors.

Cuprite is a copper oxide that is used as a pigment and in the manufacture of copper alloys.

Haematite is an iron oxide that is used in the manufacture of steel and iron alloys.

Cryolite is a mineral that is used in the production of aluminum.