Tag: energy

Quizzes (26) Questions (122)

Questions Related to energy

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by:

  1. oxidation

  2. cracking

  3. distillation under reduced pressure

  4. hydrolysis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process of breaking higher hydrocarbons with high boiling points into a variety of lower hydrocarbons that are more volatile (low boiling), is called cracking (or pyrolysis). For example, a higher hydrocarbon $C _{10}H _{22}$ splits according to the reaction.

$C _{10}H _{22}  \xrightarrow {heat \ 770K} C _8H _{18} + C _2H _4$
The process of cracking or pyrolysis increases the relative amounts of the lower hydrocarbons, which exists in a gaseous state, while higher hydrocarbons exist in the liquid or solid state.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Process of conversion of wood into coal by biochemical process, taking over millions of years is called :

  1. Catenation

  2. Carbonation

  3. Pyrolysis

  4. Destructive distillation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Process of conversion of wood into coal by biochemical process over a millions of years is called carbonation.This process occurs in the deep level of earth.

Hence option B is correct.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Cracking is a process in which :

  1. Petrol is produced by cracks on the surface of wax.

  2. Combustion of petrol is carried out.

  3. Compounds of high molecular mass are converted into compounds of lower molecular mass

  4. None of the statements is correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cracking is a chemical process in petroleum refining where heavy hydrocarbon molecules of high molecular mass are broken down into lighter, more useful molecules of lower molecular mass.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Straight chain hydrocarbons have high octane number values than branched-chain hydrocarbons. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Branched-chain hydrocarbons generally have higher octane numbers than straight-chain hydrocarbons because they burn more smoothly in engines.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Octane number can be changed by :

  1. alkylation

  2. cyclisation

  3. isomerisation

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the three reactions, i.e. alkylation, cyclisation, and isomerisation convert straight-chain hydrocarbons to branched-chain or cyclic compounds, which changes the percentage of straight-chain hydrocarbon. 


Hence, the octane number is changed.

So, the correct option is D.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Which of the following are not obtained on fractional distillation of petroleum?

  1. Paraffin wax

  2. Asphalt

  3. Coal gas

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Various fractions obtained during the fractional distillation of petroleum can be categorized into two viz, Petroleum products used as fuels: Petroleum gas, petrol, kerosene, diesel, fuel oil; Petroleum product not used as fuel:- Petroleum ether, greases, petroleum jelly, paraffin wax, pitch, asphalt.

So, Coal gas is not prepared using fractional distillation.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Breaking of higher hydrocarbon into lower one by heat is called:

  1. neutralisation

  2. polymerisation

  3. cracking

  4. acetylating
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cracking is defined as “the decomposition of high boiling hydrocarbons of high molecular weight into smaller low boiling hydrocarbons of low molecular weight”. Usually high boiling point hydrocarbons are liquids and low boiling point hydrocarbons are gases.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Which of the following is not required for the formation of coal?

  1. Dead organisms

  2. Dead vegetation

  3. Presence of oxygen

  4. High pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbonization of dead plants and animals does not happen in the presence of oxygen. This is the procedure which takes place inside the earth crust under high pressure and temperature.


 It is believed that millions of years ago, the ground below the forests was split open by natural forces such as earthquakes and volcanoes. 

The forests got buried under the surface of earth. Thus, the plants had no contact with oxygen. Successive layers of sediments sealed the buried plants. Over millions of year, these deposits were subjected to tremendous pressure and heat finally transformed them into coal.

Option C is correct.