Amongst the following, the total number of species not having eight electrons around central atom in its outermost shell, is [2023]
4
1
3
2
(3)
do not have eight electrons around central atom in their outermost shells.

Choose the correct statement: [2022]
Both diamond and graphite are used as dry lubricants.
Diamond and graphite have two dimensional network.
Diamond is covalent and graphite is ionic.
Diamond is hybridised and graphite is hybridised.