Tag: study of coal

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Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Which of the following is a characteristics of coke?

  1. Grayish-black residue

  2. Blue residue

  3. Pale white residue

  4. Brown residue
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The grayish-black residue left after the destructive distillation of coal is called as coke. Coke is obtained from coal by removing moisture and other volatile matter from it. 

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

__________ is widely used as fuel in factories and thermal power stations.

  1. Petroleum

  2. LPG

  3. Coal

  4. CNG
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Coal is widely used as a fuel in the coal based industries due to its advantages as its high calorific value. It releases less amount of smoke after burning. 

So, coal is widely used fuel in factories and thermal power stations.

Hence, option C is correct.
Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Coke is used in the preparation of :

  1. $CO+H _2$
  2. $CO+N _2$

  3. Graphite artificially

  4. Diamond artificially
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Coke is used in the preparation of water gas ($CO+H _2$), producer gas ($CO+N _2$) and graphite by artificial methods.

$C+H _2O\rightarrow CO+H _2$

$C+air\rightarrow CO+N _2$.

Hence options A,B and C are correct.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Pneumoconiosis is caused by inhalation of?

  1. coal dust

  2. silica dust

  3. cotton fibre dust

  4. asbestor dust
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation
Pneumoconiosis caused by working around dust from cotton fibers and  includes silica asbestos.
Minerals with combined exposures to coal and silica dust can get mixed dust causes Pneumoconiosis by inhalation of coal mine.

conclusion: all the four answers are matchable.
Multiple choice chemistry rocks and minerals coal and its products study of coal coal

The density of coal is _______ when compared to coke.

  1. more

  2. less

  3. same

  4. can't say anything
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coal is a naturally available substance whereas Coke is prepared substance  with some  impurities and high Carbon content, usually made from Coal.While Coal is Solid mass in physical appearance, Coke is Porous ( it means that it has large surface area ).

So the density of coal is more than the coke as coke is porous which has large surface area.

Hence option A is correct.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Peat is the first stage product of coal consisting of _____ carbon.

  1. 20%

  2. 60%

  3. 35%

  4. 80%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Peat is  first stage of transformation. Which contains 60% carbon and impurities like sufficient volatile matter and lot of moisture. It burns like wood, gives less heat, emits more smoke and leaves a lot of ash.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Coal is a substance mainly containing carbon also having oxygen, hydrogen, nitrogen and _______.

  1. sodium

  2. sulphur

  3. aluminium

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

Coal is the substance composed of mainly carbon. Hydrogen, nitrogen, sulfur, and oxygen also present as impurities. Anthracite has the most carbon, while lignite is the lowest in carbon, but highest in hydrogen and oxygen.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Which of the following fraction of coal tar distillation is obtained at 270° - 360°C?

  1. Light Oil

  2. Middle oil

  3. Green Oil

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Green oil is obtained at 270° - 360°C by distillation of coal tar. It mainly has anthracene and phenanthrene. 

So, the correct option is $C$
Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Ratio of primary air to secondary air increases with increase in the rank of coal, because the:

  1. ratio of fixed carbon to volatile matter increases

  2. high rank coals have higher amount of volatile matter

  3. calorific value of the coal increases

  4. oxygen content progressively decreases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ratio of primary air to secondary air increases with increase in the rank of coal because the ratio of fixed carbon to volatile matter increases.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

The organic compound obtained from coal is/are:

  1. benzene and phenol

  2. naphthelene

  3. anthracene

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

Most of the carbon structures in the organic part of the coal are “alkylaromatics”, that is aromatic cores with aliphatic appendages like benzene, naphthelene and anthracene.
coal is heated in several different processes, all of which produce gases, liquids, asphaltic solids, and crude carbon charcoal. These are processed furthur to give several industrial products, invariably consisting of inseparable mixtures of organic compounds.