Solved: CHEMISTRY Question for NEET

NEET CHEMISTRYEasy

Choose the correct statement:

Both diamond and graphite are used as dry lubricants.

Diamond and graphite have a two-dimensional network.

Diamond is covalent and graphite is ionic.

Diamond is $sp^3$ hybridised and graphite is $sp^2$ hybridized.

Let us evaluate each statement:

Only graphite is soft and slippery, making it useful as a dry lubricant for machines running at high temperatures. Diamond is extremely hard and is used as an abrasive.
Diamond has a rigid three-dimensional tetrahedral network, whereas graphite has a two-dimensional planar layered structure.
Both diamond and graphite are giant covalent network solids formed entirely of carbon atoms; neither of them is ionic.
In diamond, each carbon atom undergoes $sp^3$ hybridisation and is covalently bonded to four other carbon atoms. In graphite, each carbon atom undergoes $sp^2$ hybridisation and is bonded to three other carbon atoms in the same plane. Therefore, this statement is the only correct one.

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