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

Which among the following is a physical property of molecular solids?

Explain doping.

'Stability of a crystal is reflected in the magnitude of its melting points'. Comment. Collect melting points of solid water,ethyl alcohol,diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

Molecules/ions and their magnetic properties are given below.

Molecule/ion	Magnetic property
$(i). C_6H_6$	$(1).$ Antiferromagnetic
$(ii). CrO_2$	$(2).$ Ferrimagnetic
$(iii). MnO$	$(3).$ Ferromagnetic
$(iv). Fe_3O_4$	$(4).$ Paramagnetic
$(v). Fe^{3+}$	$(5).$ Diamagnetic

The correctly matched pairs are:

Amorphous substances show: