The correct answer is C. Hydrated aluminium silicate.
Fire clay is a type of clay that is used in the manufacture of firebrick, refractory bricks, and other products that need to withstand high temperatures. It is composed primarily of hydrated aluminium silicate, which is a compound of aluminium, silicon, and oxygen. The aluminium and silicon atoms are arranged in a tetrahedral structure, with the oxygen atoms forming bonds between the tetrahedra. This structure gives fire clay its high melting point and resistance to heat.
Lime is a mineral that is composed of calcium oxide. It is used in a variety of applications, including the manufacture of cement, glass, and paper. Oxide of iron is a compound of iron and oxygen. It is a common rust-colored mineral that is
found in rocks and soil. Magnesium is a chemical element that is found in nature. It is a light, silvery-white metal that is used in a variety of applications, including the manufacture of alloys, batteries, and fertilizers.In conclusion, the correct answer is C. Hydrated aluminium silicate. Fire clay is composed primarily of this compound, which gives it its high melting point and resistance to heat.