Tag: rocks and minerals

Questions Related to rocks and minerals

Coke is used in the manufacturing of :

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

  1. lead

  2. copper

  3. steel

  4. iron

Show answer
Correct Option: C
Explanation:

Coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace. The carbon monoxide produced by its combustion reduces iron oxide in the production of steel.

Which of the following is a characteristics of coke?

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

  1. Grayish-black residue

  2. Blue residue

  3. Pale white residue

  4. Brown residue

Show answer
Correct Option: A
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. 

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

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

  1. Petroleum

  2. LPG

  3. Coal

  4. CNG

Show answer
Correct Option: C
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.

Coke is used in the preparation of :

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

  1. $CO+H _2$

  2. $CO+N _2$

  3. Graphite artificially

  4. Diamond artificially

Show answer
Correct Option: A,B,C
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.

Pneumoconiosis is caused by inhalation of?

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

  1. coal dust

  2. silica dust

  3. cotton fibre dust

  4. asbestor dust

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Correct Option: A,B,C,D
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.

The density of coal is _______ when compared to coke.

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

  1. more

  2. less

  3. same

  4. can't say anything

Show answer
Correct Option: A
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.

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

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

  1. 20%

  2. 60%

  3. 35%

  4. 80%

Show answer
Correct Option: B
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.

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

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

  1. sodium

  2. sulphur

  3. aluminium

  4. chlorine

Show answer
Correct Option: B
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.

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

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

  1. Light Oil

  2. Middle oil

  3. Green Oil

  4. All of the above

Show answer
Correct Option: C
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 $C$

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

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

  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

Show answer
Correct Option: A
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.