Allotropes of Carbon

Q.

Why is iron sulphide a compound?

Q.

Is coal a metal or non metal ?

Q.

Unlike graphite diamond doesn't conduct electricity. Why?

1. Diamond is not ductile

2. Strongest matter on Earth

3. No free ions and electrons

4. Not malleable

Q.

What is the difference between coal and diamond?

Q.

Define the following terms :

(a) Allotropy

(b) Carat

(c) Crystal

(d) Catenation

Q. Wood charcoal is an excellent reducing agent.

1. True
2. False

Q.

What is Carbon?

Q.

A form of carbon that is a good conductor of heat is

1. diamond

2. graphite

3. wood charcoal

4. coke

Q. ________ is a crystalline form of carbon and one of its property is, it conducts electricity.

1. Coal
2. Coke
3. Diamond
4. Graphite

Q.

Are white and yellow phosphorus allotropes?

Q.

Can acid melt a diamond?

Q. Rhombic and monoclinic sulphur are:

1. isomers of sulphur
2. isotopes of sulphur
3. allotropes of sulphur
4. isobars of sulphur

Q.

State the terms :

(a) Substances whose atoms or molecules are arranged in a definite pattern.

(b) Different forms of an element found in the same physical state.

(c) The property by which atoms of an element link together to form long chain or ring compounds.

Q.

Breaking a graphite tip of a pencil might be little tough but peeling or sharpening pencil tips is quite easy. Could you identify why?

1. Sharp blade can peel off but cannot break obliquely

2. When pencil tip is peeled or sharpened, the cloud of electrons surrounding carbon nuclei shifts and makes it easy

3. When pencil tip is peeled or sharpened, the cloud of electrons surrounding carbon nuclei gathers and helps in peeling

4. Electrons cloud is uniform all over and helps in peeling by gathering together

Q.

Choose the correct use of allotropes of carbon.

1. Diamond:- Used for cutting and drilling rocks

   Fullerene:- Used for making pencil leads

2. Lamp Black:- Used to make shoe polishes

   Fullerene:- Used for making superconductors

3. Diamond:- Used for cutting and drilling rocks

   Bone charcoal:- To decolourise cane sugar

4. Bone charcoal:- To decolourise cane sugar

   Fullerene:- Used for making pencil leads

Q. In petroleum well , the oil is found above water . Why ?

Q.

State one use of : Diamond dust

Q.

Which property of diamonds makes them useful for making protective windows for spacecraft?

Q. Which of the following is/are the crystalline form/s of carbon?

1. Diamond

2. Graphite

3. Coke

4. Charcoal

Q.

The extremely high melting point of diamond (carbon) may be explained by the

1. Network covalent bond

2. Ionic bond

3. Hydrogen bond

4. Van der Waals forces

Q. Which charcoal is commonly known as ivory black?

1. Wood
2. Blood
3. Sugar
4. Bone

Q. Give an important use of oxygen in industry.

Q.

Choose the option that does not describe the property of a metallic solids:

1. Metallic solids are good conductors of electricity

2. There are metallic bonds present in these atoms that are holding them together

3. Metallic solids can have high melting points

4. Metalic solid is not a subcategory of crystalline solid

Q. Which of the following can conduct electricity in the solid state?

1. Sucrose, $C_{12}{H}_{22}{O}_{11}\left(s\right)$
2. Graphite, $C\left(s\right)$
3. Iron(III) chloride, $FeC{l}_3$(s)
4. Iodine, $I_2$(s)
5. Sodium hydroxide, $NaOH\left(s\right)$

Q.

Odd one among the following which does not belong to the set is

1. Graphite

2. Gold

3. Germanium

4. Ice

Q. Which of the following elements shows allotropy ?

1. Mg
2. Cs
3. Sn
4. Zn

Q. Buckminster fullerene is:

1. isotope of carbon
2. allotrope of carbon
3. none of these
4. isobar of carbon

Q. Graphite is a ______ conductor of electricity whereas diamond is a ______ conductor of electricity.

1. bad, good
2. good, bad
3. good, good
4. bad, bad

Q. Why is diamond hard and graphite brittle while both are made up of carbon atoms?

1. Difference in the melting point
2. Difference in the conductivity
3. Difference in nature of carbon bonds
4. Difference in the boiling point

Q.

Which nitrogen is maximum basic:-

1. 1
2. 2
3. 3
4. All are equally basic