What type of substance is $TiO$?

An ionic solid is a poor conductor of electricity because ..........

Select the correct statements.
$(A)$ Crystalline solids have long range order.
$(B)$ Crystalline solids are isotropic.
$(C)$ Amorphous solids are sometimes called pseudo solids.
$(D)$ Amorphous solids soften over a range of temperature.
$(E)$ Amorphous solids have a definite heat of fusion.
Choose the most appropriate answer from the options given below:

Which of the following is not a property of solids?

Explain the cause of magnetism in a substance.

Which of the following does not possess a crystalline structure?