Carbon And Its Compounds Book Back Questions 9th Science Lesson 15
9th Science Lesson 15
15] Carbon And Its Compounds
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
Graphene is most recently produced allotrope of carbon which consists of honeycomb shaped hexagonal ring repeatedly arranged in a plane. Graphene is the thinnest compound known to man at one atom thick. It is the lightest material known (with 1 square metre weighing around 0.77 milligrams) and the strongest compound discovered (100 – 300 times stronger than steel). It is a best conductor of heat at room temperature. Layers of graphene are stacked on top of each other to form graphite, with an inter planar spacing of 0.335 nanometers. The separate layers of graphene in graphite are held together by Vander Waals forces.
Choose the best answers:
1. A phenomenon in which an element exists in different modification in same physical state is called
(a) Isomerism
(b) Allotrophy
(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 his 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
Fill in the blanks:
1. ____________ names carbon.
2. Buckminster Fullerene contains ___________ carbon atoms.
3. Compounds with same molecular formula and different structural formula are known as _____________.
4. ___________________ is a suitable solven for sulphur.
5. There are ________________ plastic resin codes.
Match the following:
1. Alkyne – Bucky Ball
2. Andre Geim – Oxidation
3. C60 – Graphene
4. Thermocol – Triple bond
5. Combustion – Polystyrene
Answers:
Choose the best answers:
1. allotropy 2. Tetravalency 3. Polypropylene 4. 7 5. Graphite 6. Environment
Fill in the blanks:
1. Antoine Lavoisier 2. 60 3. Isomers 4. Carbon disulphide 5. 7
Match the following:
1.Alkyne- Triple bond
2.Andre Geim- Graphene
3.C60 – Bucky Ball
4.Thermocol- Polystyrene
5.Combustion – Oxidation