Carbon and its Compounds

Samacheer Book Back Questions And Answers For Science Standard 9 “Carbon and its Compounds“

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

2. Carbon forms large number of organic compounds due to
(a) Allotropy
(b) Isomerism
(c) Tetravalency
(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

4. Plastics made of Polycarbonate (PC) and Acrylonitrile Butadiene Styrene (ABS) are made of resin code _____.
(a) 2
(b) 5
(c) 6
(d) 7

5. Graphene is one atom thick layer of carbon obtained from
(a) diamond
(b) fullerene
(c) graphite
(d) gas carbon

6. The legal measures to prevent plastic pollution come under the _____ Protection Act 1988.
(a) Forest
(b) Wildlife
(c) Environment
(d) Human rights

II. Fill in the blanks:
1. _____ named carbon.
2. Buckminster Fullerene contains _____ carbon atoms.
3. Compounds with same molecular formula and different structural formula are known as _____.
4. _____ is a suitable solvent for sulphur.
5. There are _____ plastic resin codes.

Answers:
1. Antoine Lavoisier
2. 60
3. Isomers
4. Allotropy
5. seven

III. Match the following:
1. Alkyne             A. Bucky Ball
2. Andre Geim     B. Oxidation
3. C₆₀                  C. Graphene
4. Thermocol       D. Triple bond
5. Combution      E. Polystyrene

Answers:
1. D
2. C
3. A
4. E
5. B

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