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

Question 1. Which of the following is used in metal extraction?

Coke
Coal tar
Coal gas
Petroleum

Explanation:-

Answer: Option A. -> Coke
:
A
Coke is a pure form of carbon. It is used in the manufacture of steel and in extraction of various metals.It is used because it is cheap and readily available.

Question 2. What are the constituents of the producer gas?

Carbon dioxide & oxygen
Carbon monoxide & oxygen
Carbon dioxide & nitrogen
Carbon monoxide & nitrogen

Explanation:-

Answer: Option D. -> Carbon monoxide & nitrogen
:
D
When air is passed over red hot coke, incomplete combustion takes place resulting in the formation of CO (carbon monoxide) and the mixture of carbon monoxide and nitrogen (a major component of air) is called producer gas.

Question 3. Natural gas is mostly made up of ______.

methane
propane
butane
ethane

Explanation:-

Answer: Option A. -> methane
:
A
Natural gas is made up of hydrocarbons such as methane, ethane, propane, etc. Among these, methane makes up a major percentage of natural gas; while others are present in lesser percentage.

Question 4. 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

Explanation:-

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 5. What is the least polluting fuel for the vehicles?

Petrol
Natural Gas
Vapour Gas
Kerosene

Explanation:-

Answer: Option B. -> Natural Gas
:
B
Natural gas is stored under high pressure as Compressed Natural Gas (CNG). It is a cleaner fuel as it emits less toxic gases into the atmosphere than other fuels like petrol, diesel and coal upon combustion. Hence, it is now being used as a fuel for transport vehicles.

Question 6. Which of the following is also known as the 'black gold'?

Petroleum
Coal
Natural gas
CNG

Explanation:-

Answer: Option A. -> Petroleum
:
A
Petroleum has great commercial importance, due to which it is also calledthe 'black gold'. Many useful substances are obtained from petroleum. These are termed as 'Petrochemicals'. These are used in the manufacture of detergents, fibres (polyester, nylon, acrylic, etc.), polythene and other manmade plastics.

Question 7. Which petroleum product is used in place of coal tar for metalling the roads?

Lignite
Bitumen
Coal gas
Peat

Explanation:-

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 anaturally occurring organic byproduct of decomposed organic materials.The primary use (70%) of asphalt/bitumen is in road construction, where it is used asglue or binder mixed with aggregate particles to create asphalt concrete.

Question 8. Kerosene is not a fossil fuel.

True
False

Explanation:-

Answer: Option B. -> False
:
B
Fossil fuels are formed when dead plants and animals undergo decomposition under high pressure and temperature for a long period of time.
Petroleum is formed when dead sea organisms undergo decomposition at high temperature and pressure. Petrol, diesel and kerosene are products that are obtained by refining petroleum. Hence, kerosene is also a fossil fuel.

Question 9. Anthracite is the grade of coal that has the lowest carbon content.

True
False

Explanation:-

Answer: Option B. -> False
:
B
Anthracite is the grade of coal that has the highest percentage of carbon followed by bituminous coal, lignite and peat. Higher the grade of a coal, lower is its ash content and thus greater combustibility.

Question 10. Which of these is used to repel moths?

Naphthalene balls
Bitumen
Coal gas
Paraffin wax

Explanation:-

Answer: Option A. -> Naphthalene balls
:
A
Naphthalene or mothballis awhite solid with a pungent odour derived from thedistillationofcoal tar. It sublimesinto a pungent toxic smell whichdrives away insects and moths.