Allotropes of Carbon

Q. Match the following allotropes of carbon with their respective applications.

1. Nanotechnology
2. Gas mask
3. Shoe polish

Q. The element(s) which exhibit allotropy in its solid state is/are:

1. Silicon
2. Iron
3. Oxygen
4. Tin

Q.

Which element shows allotropy in its liquid state also?

1. Iron

2. Sulphur

3. Phosphorous

4. Carbon

Q. State True or False.
The phenomenon by which an element exists in two or more different crystalline or amorphous form is called allotropy.

1. True

2. False

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Why are gaseous fuels called 'clean fuels'? Give some examples of gaseous fuels.

Q. Choose the odd one out.

1. Carbon dioxide
2. Graphite
3. Graphene
4. Diamond

Q. An element X belongs to group 17 and element Y belongs to group 1. What type of bond will they form ?

Q. Argon is used in arc welding because of its

1. low reactivity with metal
2. ability to lower the melting point of metal
3. flammability
4. high calorific value

Q. Which of the following halide of carbon is used as refrigerant?

1. $CH{I}_4$
2. $C{F}_4$
3. $C{H}_{2}C{l}_2$
4. $C{F}_{2}C{l}_2$

Q. Which of the following substances are elements?

Q. Write short note on "Bucky ball".

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Why are gaseous fuels called 'clean fuels'? Give some examples of gaseous fuels.