Chemistry in Everyday Life

Samacheer Book Back Questions And Answers For Science Standard 8 “Chemistry in Everyday Life“

I. Choose the best answer:
1. The chemical mixed with LPG that helps in the detection of its leakage is _____.
a. methanol
b. ethanol
c. camphor
d. mercapton

2. Which is known as syn gas?
a. Marsh gas
b. Water gas
c. Producer gas
d. Coal gas

3. The unit of calorific value of fuel is _____.
a) KJmol^-1
b) KJg^-1
c) KJkg^-1
d) Jkg^-1

4. _____ is the coal of superior quality.
a) Peat
b) Lignite
c) Bituminous
d) Anthracite

5. The main component of natural gas is _____.
a) methane
b) ethane
c) propane
d) butane

II. Fill in the blanks:
1. Producer gas is a mixture of _____ and _____.
2. _____ is known as marsh gas.
3. The term petroleum means _____.
4. Heating coal in the absence of air is called _____.
5. An example for fossil fuel is _____.

Answers:
1. Carbon monoxide and nitrogen
2. Methane
3. rock oil
4. destructive distillation
5. coal

III. Match the following:
1. Octane rating                   A. Diesel
2. Cetane rating                   B. Methane
3. Simplest hydrocarbon     C. Petrol
4. Peat                                 D. Brown in colour
5. Lignite                             E. First stage coal

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

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