Tag: chemistry

Questions Related to chemistry

Natural gas mainly consist of:

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

  1. $C _2H _6$

  2. $CH _4$

  3. $C _3H _3$

  4. $C _4H _{10}$

Show answer
Correct Option: B
Explanation:
Natural gas is naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly includes varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide or helium.
So answer is B.

Select the incorrect statements among the following.
(i) Bitumen is used for metalling the roads.
(ii) Some inexhaustible natural resources like coal, petroleum and natural gas formed from the dead remains of living organisms are known as fossil fuels.
(iii) Many useful substances are obtained from coal (commercial importance), so it is also called as 'Black gold'.
(iv) Natural gas is used as starting material for the manufacture of a number of chemicals and fertilizers.

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

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (ii),(iii) and (iv)

  4. All are correct

Show answer
Correct Option: C
Explanation:

1) Bitumen is the one of the component of petroleum which is used for metalling / surfacing the roads.

2) Coal, petroleum and natural gases are exhaustible natural resources. Hence, this option is wrong.
3) Petroleum is called as 'Black gold' because it gives many useful substances.Hence,this is wrong.
4) Coal is used as starting material for the manufacture of a number of chemicals and fertilizers. Hence option 4 is incorrect.

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.