Which one of the following metal oxides is antiferromagnetic in nature?

Write the uses of $n$-type and $p$-type semiconductors.

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?

Which of the following elements has a simple cubic lattice structure in its solid state?

Which of the following statements is $NOT$ true about polymorphism?

Why do solids have a definite volume?