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Questions Related to world energy needs

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

50% benzol is named so because 100. c.c of the fraction when distilled below 100 deg C gives 50 c.c of distillate.

  1. True

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

50% benzol or 90% Toluol is named so because 50% of it distills upto 100 deg C and 90% of it distills between 110-140 deg C. 50% benzol or 90% Toluol consists mainly of xylenes and small amounts of benzene and toluene.

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

Which of the following compound/(s) obtained during fractional distillation of 50% benzol or 90% Toluol are used as solvents?

  1. benzene

  2. toluene

  3. xylene

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

Benzene, toluene and xylene, obtained during fractional distillation of 50% benzol or 90% Toluol are used as solvents. They are also used in dry cleaning, as fuel and for preparing dyes, drugs, explosives etc.

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

Which of the following is/are true?

  1. When carbolic oil is cooled, naphthalene crystallizes out

  2. Naphthalene is purified by sublimation

  3. Naphthalene is used for manufacture of dyes, drugs, explosives etc

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

All of the following statements are true.
When carbolic oil is cooled, naphthalene crystallizes out.
Naphthalene is purified by sublimation.
Naphthalene is used for manufacture of dyes, drugs, explosives etc.

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

Which fraction contains pyridine?

  1. Light oil or crude naphtha

  2. Middle oil or carbolic oil

  3. Heavy oil or Creosote oil

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

Light oil or crude naphtha contains pyridine.
Whereas middle oil or carbolic oil contains phenol and naphthalene and green oil contains anthracene.

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