MHTCET 15 Apr 2026 Shift 2 Paper

Concept:Covalent crystals are network solids in which atoms are linked by strong covalent bonds in a continuous three-dimensional structure.Explanation:$\mathrm{SiO}_{2}$ is a covalent crystal because each silicon atom is covalently bonded to oxygen atoms, forming a three-dimensional network.Fe is a metallic solid, held together by metallic bonding.$\mathrm{CH}_{4}$ is a molecular solid, with molecules held by weak intermolecular forces.KCl is an ionic solid, consisting of $\mathrm{K}^{+}$ and $\mathrm{Cl}^{-}$ ions.Thus, only $\mathrm{SiO}_{2}$ behaves as a covalent crystal.Answer:Option C: $\mathrm{SiO}_{2}$