what is the valency of carbon in carbon dioxide and graphite

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Solution

Dear student

The valency of carbon is always 4 in all the compounds. The difference lies just in the bonding.
In graphite, carbon undergoes sp² hybridisation. Carbon atom in graphite form three sigma bonds with another three carbons and these sigma bonds are formed by the overlap of three sp ² hybridised orbitals of carbon (one s orbital mixes with the two p orbitals of carbon to form sp ² hybridised orbitals). The remaining perpendicular p orbitals of carbon are used for the delocalisation of Π electrons.

In CO₂ also, the valency of carbon is 4
Let x be the valency of C
then x+2(-2) =0
x-4=0
x=4
Regards

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