Coal And Petroleum(8th Grade > Chemistry ) Questions and answers for exam Preparation

8th Grade > Chemistry

COAL AND PETROLEUM MCQs

Total Questions : 55 | Page 4 of 6 pages

Identify the product that is produced by baking coal in a heated oven.

Coke
Coal tar
Coal gas
Solid coal

Discuss Question

Answer: Option A. -> Coke
:
A
Coke is produced by baking coal in a heated oven. It is a fuel with high carbon content, generally used in the extraction of metals, manufacture of graphite, as a household fuel etc. Its price in the market depends upon the amount of ash and sulphur content present in it.

Question 32.

Which of the following can be used as a solvent in dry cleaning?

Water
Coal gas
Coal Tar
Petroleum

Discuss Question

Answer: Option D. -> Petroleum
:
D
Petroleum is used as a solvent in dry cleaning industry due to its high degreasing ability, i.e., it can easily remove stains from clothes. It is one among the three commonly used solvents used in this industry and has been used since ancient times.

Question 33.

Match the following:
$\begin{matrix} P e t r o l e u m P r o d u c t s & U s e s 1. P e t r o l & a . P a i n t s a n d R o a d s u r f a c i n g 2. P a r a f f i n w a x & b . F u e l f o r s t o v e 3. K e r o s e n e & c . C a n d e l s a n d v a s e l i n e 4. L P G & d . F u e l f o r v e h i c l e s 5. B i t u m e n & e . C o o k i n g c y l i n d e r \end{matrix}$

1-d, 2-c, 3-b, 4-e and 5-a
1-c, 2-d, 3-b, 4-e and 5-a
1-e, 2-c, 3-b, 4-a and 5-d
1-d, 2-c, 3-e, 4-b and 5-a

Discuss Question

Answer: Option A. -> 1-d, 2-c, 3-b, 4-e and 5-a
:
A

The table below shows the list of petroleum byproducts and their respective uses.
$\begin{matrix} P e t r o l e u m P r o d u c t s & U s e s P e t r o l & F u e l f o r v e h i c l e s P a r a f f i n w a x & C a n d e l s a n d v a s e l i n e K e r o s e n e & F u e l f o r s t o v e P e t r o l e u m G a s & A s L P G B i t u m e n & P a i n t s a n d R o a d s u r f a c i n g \end{matrix}$

Question 34.

Identify the substance which is tough, porous and black. It is almost a pure form of carbon.

Crude oil
Coke
Coal tar
Coal gas

Discuss Question

Answer: Option B. -> Coke
:
B
Coke is a tough, porous and black substance. It is almost a pure form of carbon. It is used in the manufacture of steel and also in the extraction of many metals.

Question 35.

The slow process of conversion of dead vegetation into coal is called _____.

decomposition
evolution
carbonification
carbonisation

Discuss Question

Answer: Option D. -> carbonisation
:
D
Plants contain mainly carbon, which gets converted into coal. Hence, the slow process of conversion of dead vegetation into coal is called carbonisation.

Question 36.

Select the fuel that has high calorific value, burns readily and can be used as fuel in homes and automobiles.

Petroleum
Paraffin wax
Kerosene oil
Natural gas

Discuss Question

Answer: Option D. -> Natural gas
:
D
Natural gas is stored under high pressure as Compressed Natural Gas (CNG). CNG is used for power generation. It is also a less polluting fuel used for automobiles. The great advantage of CNG is that it can be used directly for burning, in homes and factories. It also has a higher calorific value than most of the other fuels.

Question 37.

Which of the following are the uses of bitumen?

Paint
Candles
Road surfacing
Motor fuel

Discuss Question

Answer: Option A. -> Paint
:
A and C
Bitumen is one of the products formed from petroleum. This is used in paints and road surfacing. The primary use (70%) of asphalt/bitumen is in road construction, where it is used as the glue or binder mixed with aggregate particles to create asphalt concrete.

Question 38.

Which petroleum product is used in place of coal tar for metalling the roads?

Lignite
Bitumen
Coal gas
Peat

Discuss Question

Answer: Option B. -> Bitumen
:
B

Bitumen, a petroleum product, is used in place of coal-tar for metalling the roads. It is a very good adhesive. It sticks well to the sub layers. Bitumen is a black, oily, viscous material that is a naturally occurring organic byproduct of decomposed organic materials. The primary use (70%) of asphalt/bitumen is in road construction, where it is used as glue or binder mixed with aggregate particles to create asphalt concrete.

Question 39.

We get pungent smell when there is LPG leakage even though natural gas is odourless. Identify the proper reason for this smell.

LPG gas undergoes oxidation and produces a pungent smell.
A chemical with a pungent odour is added in LPG/CNG to detect leakage.
LPG gas reacts with walls of the cylinder to produce a pungent smell.
Compressed LPG gas has a pungent smell.

Discuss Question

Answer: Option B. -> A chemical with a pungent odour is added in LPG/CNG to detect leakage.
:
B
Any accidental leakage can cause an explosion. If the gas leaks in any closed space such as kitchen, etc. then on lighting a matchstick, an explosive mixture will burst into flame causing fire in the house and can cause serious burn injuries.
In order to prevent this, LPG companies add a chemical ethyl mercaptan which helps in detection of the leakage because of the smell imparted.

Question 40.

Identify the gas that is generally produced when coal is burnt in the presence of a lot of air.

Carbon monoxide
Sulphur dioxide
Carbon dioxide
Nitrogen dioxide

Discuss Question

Answer: Option C. -> Carbon dioxide
:
C

Coal is mainly composed of carbon. When coal is burnt in the presence of air, carbon reacts with oxygen gas that is present in air (atmosphere) and produces carbon dioxide gas ( ${CO}_{2}$ ).
When carbon (coal) is burnt in limited presence of oxygen, carbon monoxide ( $CO$ ) is produced.