Question

# Which of the following is a network solid?A.$S{O_2}(solid)$B.${I_2}$C.$diamond$D.${H_2}O(ice)$

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Hint:
Allotropy is a phenomenon where an element can exist in two or more forms that have different physical properties and similar or almost similar chemical properties.
Carbon exhibits two allotropic forms:
Crystalline – eg diamond, graphite, fullerene.
Amorphous- coal, coke, lampblack, wood charcoal, sugar charcoal, bone charcoal, gas carbon, etc.

Diamond has a three-dimensional network of carbon atoms joined tetrahedrally with each other through strong covalent bonds. Each carbon atom is in a state of $s{p^3}$hybridization and has a tetrahedral linkage to four neighboring carbon atoms. This network extends in all the three dimensions forming an open cage-like structure. The network formed by the atoms in-network solid is very hard as it forms strong covalent bonds. For this reason, the diamond is extremely hard and has a very high melting point.