are less dense than water.

Which one among the following is a form of carbon?

1. Graphite
2. Fullerene
3. Quartz

Select the correct answer from the code given below:

Consider the following statements about Hydrofluorocarbons (HFCs):

1. HFCs are organic compounds having fluorine and Hydrogen atoms and are used widely as Refrigerants.
2. HFCs are very harmful to the Ozone layer as it reacts with the free radicals and prevents the formation of Ozone.
3. The use of HFCs has to be phased out completely by 2030 according to Montreal Protocol.

Which of the above statements is/are correct?

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 $100\}$

Consider the following statements about Graphene:

1. It is a poor conductor

2. It is heavier than steel with high rigidity

3. It is the thinnest material possible as well as being transparent

4. It can be used as 'conducting electrodes' requires for touch screens, LCD's and organic LED's

Which of the statements given above is/are NOT correct?

Which of the following statements are Correct about Syngas?

1. It is a mixture of CO and $H_2$ . 
2. It is produced from sewage.
3. Coal gasification is the process of producing syngas from coal.

Select the correct answer using the code given below: