One Mark Questions Answers

CHEMISTRY

CARBON AND ITS COMPOUNDS

TEXT BOOK EXERCISES

I. Choose the correct answer :

1. A phenomenon in which an element exists in different modification in same physical state is called

(a) isomerism

(b) allotropy

(c) catenation

(d) crystallinity

[Answer: (b) allotropy]

2. Carbon forms large number of organic compounds due to

(a) Allotropy

(b) Isomerism

(c) Tetravalency .

(d) Catenation

[Answer: (d) Catenation]

3. Nandhini brings her lunch every day to school in a plastic container which has resin code number 5. The container is made of

(a) Polystyrene

(b) PVC

(c) Polypropylene

(d) LDPE

[Answer: (c) Polypropylene]

4. Plastics made of Polycarbonate (PC) and Acrylonitrile Butadiene Styrene (ABS) are made of resin code _――― .

(a) 2

(b) 5

(c) 6

(d) 7

[Answer: (a) 7]

5. Graphene is one atom thick layer of carbon obtained from

(a) diamond

(b) fullerene

(c) graphite

(d) gas carbon

[Answer: (c) graphite)

6. The legal measures to prevent plastic pollution come under the _――― Protection Act 1988.

(a) Forest

(b) Wildlife

(c) Environment

(d) Human rights

[Answer: (c) Environment]

II. Fill in the blanks :

1. Antoine Lavoisier named carbon.

2. Buckminster Fullerene contains 60 carbon atoms.

3. Compounds with same molecular formula and different structural formula are known as Isomers .

4. Allotropy is a suitable solvent for sulphur.

5. There are seven plastic resin codes.

III. Match the following :

1. Alkyne - Bucky Ball

2. Andre Geim - Oxidation

3. C₆₀ - Graphene

4. Thermocol - Triple bond

5. Combution - Polystyrene

Answer:

1. Alkyne - Triple bond

2. Andre Geim - Graphene

3. C₆₀ - Bucky Ball

4. Thermocol - Polystyrene

5. Combustion - Oxidation