Which of the following gases is of brown colour?

The ability of metals to be drawn into thin wire is known as

Give the composition of the alloys brass and bronze.

Why do ionic compounds not conduct electricity in the solid state?

In the $Hall-Heroult$ process,which substances are added to alumina to lower its melting point?

The following reaction takes place when aluminium powder is heated with $MnO_2$:
$3MnO_2(s) + 4Al(s) \rightarrow 3Mn(l) + 2Al_2O_3(l) + \text{Heat}$
$(a)$ Is aluminium getting reduced?
$(b)$ Is $MnO_2$ getting oxidised?