Explain the difference in properties of diamond and graphite on the basis of their structures.

Silicon is an important component of which of the following?

Non-oxide ceramics can be

Silicon is an important constituent of

It is observed that $Pb^{2+}$ is more stable than $Pb^{4+}$,while $Sn^{2+}$ is less stable than $Sn^{4+}$. Consider the following reactions:
$PbO_{2} + Pb \rightarrow 2PbO; \Delta_{r}G^{\circ} (1)$
$SnO_{2} + Sn \rightarrow 2SnO; \Delta_{r}G^{\circ} (2)$
Identify the correct set from the following.

Identify the incorrect order against the stated property.