Glass is a

Which metal crystallises in a simple cubic structure?

Match items of List-$I$ with those of List-$II$ :

List-$I$ (Property)	List-$II$ (Example)
$a$. Diamagnetism	$i$. $MnO$
$b$. Ferrimagnetism	$ii$. $O_{2}$
$c$. Paramagnetism	$iii$. $NaCl$
$d$. Antiferromagnetism	$iv$. $Fe_{3}O_{4}$

Choose the most appropriate answer from the options given below:

$STATEMENT-1$: Band gap in germanium is small.
$STATEMENT-2$: The energy spread of each germanium atomic energy level is infinitesimally small.

Which among the following is ferromagnetic in nature?

What type of substance is $TiO$?