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Chapter: 9th Science : Chemistry : Carbon and its Compounds

One Mark Questions Answers

Science : Chemistry : Carbon and its Compounds : Book Back Important Questions, Answers, Solutions : I. Choose the correct answer, II. Fill in the blanks, III. State whether true or false. If false, correct the statement, IV. Match the following, V. Assertion and reason type questions

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

 

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