Bond angle in structure of diamond is :

Match list-I with List-II :

Choose the correct answer from the options given below:

Identify the correct statements regarding fullerene.

$\mathrm{i}.$ It has $60$ vertices.
$\mathrm{ii}.$ All the carbon atoms are in the ${\mathrm{sp}}^3$ hybridisation.
$\mathrm{iii}.$The number of rings having six carbons each is $20$ and the number of rings having five carbons each is $12$.
$\mathrm{iv}.$  All the $\mathrm{C}-\mathrm{C}$ bond lengths in it are equal.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Give reason why graphite is used as a lubricant?

What are allotropes? Sketch the structure of two allotropes of carbon namely diamond and graphite. What is the impact of structure on physical properties of two allotropes?