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 represents the chief constituents of creosote oil?

  1. Benzene, toluene, xylenes, etc.

  2. Phenol, naphthalene, etc.

  3. Cresols, naphthalene, etc.

  4. Anthracene, phenanthrene, etc.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cresols, naphthalene, etc. represents the chief constituents of Creosote oil.

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

Ammonia liquor is prepared by dissolving:

  1. ammonia gas in alcohol

  2. ammonia gas in water

  3. ammonia gas in hydrochloric acid

  4. ammonia gas in caustic soda solution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonia liquor is prepared by dissolving Ammonia in water. Ammonia liquor is also known as ammonia water or some times known as ammonium hydroxide.
In aqueous solution, ammonia deprotonates a small fraction of the water to give ammonium and hydroxide according to the following equilibrium:
$ NH _3 +H _2O\rightarrow NH _4^{+} + OH^{-}$

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

During fractional distillation, at what temperature range is carbolic oil or middle oil collected?

  1. upto 170$^o$

  2. 170 - 230 $^o$

  3. 230 - 270 $^o$

  4. 270-360$^o$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During fractional distillation,  carbolic oil or middle oil is collected up to 170 - 230 $^o$.

Above this temperature, the Anthracene oil is obtained.

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.