Question:

Graphite is black in colour. This is because

Updated On: Jul 6, 2022

graphite is obtained from coke which is black in colour
it is an allotrope of carbon
it is impure and amorphous form of carbon
in graphite, the fourth non bonded singly occupied $p_z$ - orbital of each C-atom overlaps to give completely delocalized system of molecular orbitals. Due to the excitation of these electrons, graphite appears hlack

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The Correct Option is D

Solution and Explanation

In graphite, the fourth $p_z$ orbital of each C-atom overlaps to give completely delocalized system of molecular orbitals. Due to the excitation of these delocalized electrons, graphite appears black.

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Notes on p -Block Elements

Concepts Used:

P-Block Elements

P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of:

Group 13 Elements: Boron family
Group 14 Elements: Carbon family
Group 15 Elements: Nitrogen family
Group 16 Elements: Oxygen family
Group 17 Elements: Fluorine family
Group 18 Elements: Neon family