Choose the correct statement :
- A
Diamond is covalent and graphite is ionic.
- B
Diamond is sp hybridised and graphite is sp hybridised.
- C
Both diamond and graphite are used as dry lubricants.
- D
Diamond and graphite have two dimensional network.
In diamond every carbon is bonded to four other carbon atoms by single covalent bonds in a tetrahedral arrangement, giving sp hybridisation and a three-dimensional network.
In graphite each carbon is bonded to three other carbon atoms within a layer, giving sp hybridisation, planar hexagonal sheets, and weakly held layers.
Both forms are covalent (option 1 wrong), only graphite is used as a dry lubricant because of its slippery layered structure (option 3 wrong), and diamond has a 3D network while graphite has 2D sheets (option 4 wrong).
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