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Which of the following is network solid?
(A) \[S{O_{2(solid)}}\]
(B) \[{I_2}\]
(C) Diamond
(D) \[{H_2}{O_{(ice)}}\]

seo-qna
Last updated date: 29th Mar 2024
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MVSAT 2024
Answer
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Hint: Network solids are made up of covalently bonded atoms. They are bonded in a way that they form a continuous network like structure. They have covalent bonding throughout their structure.

Complete answer:

Let’s see the definition of network solid in order to identify its example: A solid in which its constituent atoms are bonded in a way that it forms a continuous network by covalent bonds throughout the material, is called network solid.

- It means that network solids should have covalent bonding throughout the material. We know that not all elements show covalent bonding. There are some basic requirements that an atom should have in order to form covalent bonds.
- We know that covalent bond results by the sharing of an electron each by two atoms to form a bond containing two electrons. Now, only those elements that cannot easily gain or lose electrons to complete their valence shell, choose this way of bonding which is covalent bonding. e.g. Carbon has four electrons in its outermost shell and so it favors covalent bonding. It is also proved that the atoms that have less difference in their electronegativity, can form covalent bonds with each other.
- Network solids do not include molecules in their structure; they only have atoms.

Now, let’s analyze the options to identify a network solid out of them.

- Solid sulfur dioxide is a molecule and so even though it is a solid and has covalent bonding, it is not a network solid because it is a molecule.

- Solid iodine also has covalent bonding between two iodine atoms but it itself is a molecule and network solid is not formed by molecules, so it is also not a network solid.

- Ice is an ionic solid and it is also a molecule, so it cannot form a network solid.

- Diamond is made up of covalently bonded carbon atoms. It is an allotrope of carbon. Carbon can form covalent bonds with other carbon atoms and thus the bond formed will be also between the atoms only. We know that each carbon atom forms covalent bonds with other three carbon atoms and hence the resultant structure is called a network solid as it is spread in three dimensions in space.

So, the correct answer is option (C) Diamond.

Note:
Do not think that solid iodine will form network solid because if molecules have covalent bonding, they cannot take part in the formation of the network solid because network solids can be formed by covalent bonding between atoms only.
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