Tag: non-renewable sources of energy

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Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

Which of the following is/are true regarding creosote oil?

  1. It contains cresols along with some naphthalene and quinoline.

  2. It is not worked up because its constituents are more easily obtained by synthetic methods.

  3. It is used as such under the name of creosote oil for the preservation of wood and for the manufacture of some disinfectants.

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

All of the given statements are true regarding creosote oil.
It contains cresols along with some naphthalene and quinoline.
It is not worked up because its constituents are more easily obtained by synthetic methods.
It is used as such under the name of creosote oil for the preservation of wood and for the manufacture of some disinfectants.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

Which of the following is used in varnishes, road-making and protecting wood and metal work?

  1. pitch or undistilled residue

  2. creosote oil

  3. carbolic oil

  4. crude naphtha
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Pitch or undistilled residue is used in varnishes, road-making and protecting wood and metal work

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

Coal tar is the main source of:

  1. aromatic compounds

  2. alicyclic compounds

  3. aliphatic compounds

  4. nitro compounds
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coal tar is a complex mixture of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds but it is mainly used as the main source for aromatic compounds.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

When fractional distillation of coal tar is carried out, the percentage of which fraction is maximum?

  1. Pitch

  2. Gasoline

  3. Lubricating oil

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

When fractional distillation of coal tar is carried out,  the maximum percentage is of pitch. Pitch is undistilled residue. It is about 50-60%.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

When a fractional distillation of coal tar is carried out, the percentage of which fraction is minimum?

  1. Light oil or crude naphtha

  2. Middle oil or carbolic oil

  3. Heavy oil or creosote oil

  4. Green oil or anthracene oil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During the fractional distillation of coal tar, the fraction which has minimum percentage is light oil or crude naphtha. It is obtained only $1.5-2\%$ in the distillation.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

Separation of two substances by crystallisation depends upon their differences in:

  1. densities

  2. solublity

  3. melting point

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

Separation of $2$ substances by crystallization depends upon their difference in solubility as more soluble impurity will go into the solution and less soluble component will crystallize out.