Tag: coal

Questions Related to coal

Coal is a fossil fuel and it cannot be prepared in a laboratory or industry because the formation of coal :
a. is very slow process.
b. needs very low pressure and low temperature.
c. needs very high pressure and high temperature.
d. causes air pollution.
Select the correct alternative.

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. a,  c and d

  2. b and d

  3. c and a

  4. d and c

Show answer
Correct Option: A
Explanation:

Coal is a fossil fuel derived from organic matter. We get coal deep inside the Earth's crust in coal mines. When dead plants got buried into the bottom of the soil. Due to high pressure and temperature plants gets converted into fossil fuels. If it is burn in large quantity it causes pollution.

Choose the incorrect statement among the following.

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. Many useful substances are obtained from petroleum and natural gas. These are termed as 'petrochemicals'

  2. Hydrogen gas obtained from natural gas is used in the production of fertilizers

  3. Due to the great commercial importance of petroleum, it is also called 'black gold'

  4. Natural gas is stored under low pressure as compressed natural gas (CNG)

Show answer
Correct Option: D
Explanation:

CNG is made by compressing natural gas (which is mainly composed of methane, CH4 stored at high pressure), to less than 1 percent of the volume, it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 20–25 MPa (2,900–3,600 psi), usually in cylindrical or spherical shapes.

Thus they are stored under high pressure.

Which is the important constituent (95%) of natural gas?

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. Methane

  2. Propane

  3. Ethane

  4. Chlorine

Show answer
Correct Option: A
Explanation:

Methane is the important constituent (95%) of natural gas. Methane has high heat of combustion. Hence, it is used as fuel.
$CH _4 + 2O _2 \rightarrow CO _2 + 2H _2O + heat$

Which of the following is used for refining of petroleum?

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. Steam distillation

  2. Distillation under reduced pressure

  3. Solvent extraction

  4. Fractional distillation

Show answer
Correct Option: D
Explanation:

Fractional distillation is used for refining of petroleum.

Which of the following is properly matched?

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. Kerosene - $C _5\, -\, C _{10}$

  2. Diesel oil - $C _5\, -\, C _6$

  3. Petrol - $C _7\, -\, C _9$

  4. All are correct

Show answer
Correct Option: C
Explanation:

The number of carbon atoms in petrol is $C _{7}-C _{9}$.

The major constituent of natural gas is:

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. methane

  2. ethane

  3. propane

  4. ethene

Show answer
Correct Option: A
Explanation:

Natural gas is primarily composed of methane, but also contains ethane, propane and heavier hydrocarbons. It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and trace amounts of water.

Which of the following is/are main component present in LPG?

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. methane

  2. propane

  3. butane

  4. both B and C

Show answer
Correct Option: D
Explanation:

LPG is liquefied petroleum gas. The main components are:

  1. butane
  2. propane
  3. propylene
  4. butylene.
All the components are gases at normal temperature and pressures.

Which of the following hydrocarbon exists mostly in the gaseous state under the earth surface?

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. Pentane

  2. Butane

  3. Hexane

  4. Octane

Show answer
Correct Option: B
Explanation:

In its strictest sense, petroleum includes only crude oil, but in common usage, it includes all liquid, gaseous and solid hydrocarbons.Under surface pressure and temperature conditions, lighter hydrocarbons methane, ethane, propane and butane occur as gases, while pentane and heavier hydrocarbons are in the form of liquids or solids.


Heavier crude oils have too much of:

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. Carbon

  2. Hydrogen

  3. Both Carbon and Hydrogen

  4. Sulfur

Show answer
Correct Option: A
Explanation:

Because heavier crude oils have too much carbon and not enough hydrogen, the cracking processes generally involve removing carbon from or adding hydrogen to the molecules and using fluid catalytic cracking to convert the longer, more complex molecules in the oil to the shorter, simpler ones in the fuels.

Gas cap over crude oil is formed by:

chemistry rocks and minerals coal petroleum non-renewable sources of energy

  1. methane

  2. natural gas

  3. butane

  4. producer gas

Show answer
Correct Option: B
Explanation:

In the reservoir, crude oil is usually found in association with natural gas, which is lighter forms a "gas cap" over the petroleum, and saline water which, being heavier than most forms of crude oil, generally sinks beneath it.