Chemistry · General Awareness

Carbon and Fossil Fuels

1,898 Questions

Review fundamental concepts regarding carbon compounds, coal distillation, and fossil fuel formation. This segment covers the chemical properties and industrial applications of natural gas and crude oil. Practicing these questions will strengthen your chemistry foundation for general science sections.

Coal distillationPetroleum formationProperties of crude oilNatural gas applications

Carbon and Fossil Fuels Questions

Multiple choice

Which of the following could replace 'taps' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option from each list according to the corresponding number in the passage.
A candle's beauty is not preatiness (1) of colour or shape, but rather (2) something else: "Not the best-looking thing, but the best-acting thing." A candle taps (3) all of the known laws of the universe.
The heat of the flame melts the wax and draws up (4) currents of air to cool the wax at the periphery, thus creating a cup (5) for the molten wax, which remains horizontal thanks (6) to gravity - "the same force of gravity which holds worlds together". Capillary action draws the melted wax up the wick from cup to flame, while the flame's heat triggers (7) a chemical reaction in the wax that sustains (8) the flame.

  1. stops

  2. calls

  3. uses

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

The burning of a candle involves use of several laws of the universe.

Multiple choice

Which of the following could replace 'triggers' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option from each list according to the corresponding number in the passage.
A candle's beauty is not preatiness (1) of colour or shape, but rather (2) something else: "Not the best-looking thing, but the best-acting thing." A candle taps (3) all of the known laws of the universe.
The heat of the flame melts the wax and draws up (4) currents of air to cool the wax at the periphery, thus creating a cup (5) for the molten wax, which remains horizontal thanks (6) to gravity - "the same force of gravity which holds worlds together". Capillary action draws the melted wax up the wick from cup to flame, while the flame's heat triggers (7) a chemical reaction in the wax that sustains (8) the flame.

  1. creates

  2. activates

  3. ceases

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

'Triggers' means starts up or activates.

Multiple choice

Which of the following could replace 'cup' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option from each list according to the corresponding number in the passage.
A candle's beauty is not preatiness (1) of colour or shape, but rather (2) something else: "Not the best-looking thing, but the best-acting thing." A candle taps (3) all of the known laws of the universe.
The heat of the flame melts the wax and draws up (4) currents of air to cool the wax at the periphery, thus creating a cup (5) for the molten wax, which remains horizontal thanks (6) to gravity - "the same force of gravity which holds worlds together". Capillary action draws the melted wax up the wick from cup to flame, while the flame's heat triggers (7) a chemical reaction in the wax that sustains (8) the flame.

  1. trophy

  2. beaker

  3. hollow

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

The edges of a burning candle are a little raised and the centre is depressed as in a hollow.

Multiple choice

Which of the following could replace 'sustains' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option from each list according to the corresponding number in the passage.
A candle's beauty is not preatiness (1) of colour or shape, but rather (2) something else: "Not the best-looking thing, but the best-acting thing." A candle taps (3) all of the known laws of the universe.
The heat of the flame melts the wax and draws up (4) currents of air to cool the wax at the periphery, thus creating a cup (5) for the molten wax, which remains horizontal thanks (6) to gravity - "the same force of gravity which holds worlds together". Capillary action draws the melted wax up the wick from cup to flame, while the flame's heat triggers (7) a chemical reaction in the wax that sustains (8) the flame.

  1. replaces

  2. converts

  3. maintains

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

Here sustains means maintains, that is it helps in keeping the flame going.

Multiple choice

Which of the following could replace 'rather' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option from each list according to the corresponding number in the passage.
A candle's beauty is not preatiness (1) of colour or shape, but rather (2) something else: "Not the best-looking thing, but the best-acting thing." A candle taps (3) all of the known laws of the universe.
The heat of the flame melts the wax and draws up (4) currents of air to cool the wax at the periphery, thus creating a cup (5) for the molten wax, which remains horizontal thanks (6) to gravity - "the same force of gravity which holds worlds together". Capillary action draws the melted wax up the wick from cup to flame, while the flame's heat triggers (7) a chemical reaction in the wax that sustains (8) the flame.

  1. truly

  2. mainly

  3. actually

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

The real reason or the actual reason is being talked about.

Multiple choice

Which of the following could replace 'draws up' as used in the passage?

Directions: Read the following passage carefully and select the most suitable option from each list according to the corresponding number in the passage.
A candle's beauty is not preatiness (1) of colour or shape, but rather (2) something else: "Not the best-looking thing, but the best-acting thing." A candle taps (3) all of the known laws of the universe.
The heat of the flame melts the wax and draws up (4) currents of air to cool the wax at the periphery, thus creating a cup (5) for the molten wax, which remains horizontal thanks (6) to gravity - "the same force of gravity which holds worlds together". Capillary action draws the melted wax up the wick from cup to flame, while the flame's heat triggers (7) a chemical reaction in the wax that sustains (8) the flame.

  1. obtains

  2. carries

  3. provides

  4. utilises
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It makes use of the currents of air to cool the wax at the periphery

Multiple choice chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

$H _2$ is best alternative to fossil fuels but use of hydrogen as a fuel is dangerous because:

  1. it is chemically unstable.
  2. the storage of $H _2$ is very risky and can causes explosion.

  3. it is very expensive.

  4. it causes the corrosion of containers in which it is present
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$H _2$ is best alternative to fossil fuels but use of hydrogen as a fuel is dangerous because the storage of $H _2$ is very risky and causes explosion because of low ignition energy.

Multiple choice allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

$C _{12}H _{22}O _{11}\xrightarrow{Conc.   H _2SO _4} 12C+11H _2O$
Which of the following is obtained by the above reaction?

  1. Animal charcoal

  2. Sugar charcoal

  3. Coke

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

Conc. $H _{2}SO _{4}$ is dehydrating agent. It dehydrates cane sugar to sugar charcoal.

           $C _{12}H _{22}O _{11}\,\,\,\xrightarrow{conc.H _2SO _4}\underset{sugar\ charcoal}{12C}+11H _{2}O$