Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

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

Which of the following constituents of coal is the most important in production of coke?

  1. Ash

  2. Moistures

  3. Carbon

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coal is the measurable exhaustible natural fuel. It is processed in the industry to get products like coke. Carbon is the measurable constituent of coke which is required in the production of coke.

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

On which of the following content of coke, its price depend?

  1. Sulphur

  2. Ash

  3. Nitrogen

  4. Both a and b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Price of the coke depends upon the coal which is used for the production of coke. Because the concentration of sulphur and ash vary in cokes, this is the main content of the coke on which its price depends.

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

Coke is used in the manufacturing of :

  1. lead

  2. copper

  3. steel

  4. iron
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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.