Tag: chemistry

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

Which one is a better fuel, coal or coke?

  1. Coke is a better fuel because coke produces more heat on burning as compared to coal

  2. Coal is a better fuel because coal does not produce more heat on burning as compared to coke

  3. Both are of equal efficiency

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coke is a better fuel because coke  produces more heat on burning as compared to coal. Coke has higher calorific value than coal. When equal masses of coke and coal are bunt, coke produces more heat. Also when coke is burnt, smoke is not obtained whereas coal produces smoke on coal.

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

_________ is produced by passing air over red-hot coke.

  1. Natural gas

  2. Producer gas

  3. Biomass

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

Coke is used in the preparation of producer gas which is a mixture of carbon monoxide and nitrogen. Producer gas is produced by passing air over red-hot coke. Coke is also used to manufacture water gas.

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

................ is a flammable gaseous fuel made from coal and supplied to the user via a piped distribution system.

  1. Coal tar

  2. Coal gas

  3. Petroleum

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

Coal gas is a flammable gaseous fuel made from coal and supplied to the user via a piped distribution system. Town gas is a more general term referring to manufactured gaseous fuels produced for sale to consumers and municipalities.

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

Natural coke is also called as:

  1. carbonite coke

  2. bakelite

  3. petroleum fuel

  4. none of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural coke is also called as carbonite coke. It is formed by metamorphism from bituminous coal when intrusive igneous rock cuts across vein of coal.

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

________ is among the by-products when coal is carbonized to make coke.

  1. Coal tar

  2. Coal

  3. Carbon dioxide

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

Coal tar is a brown or black liquid of extremely high viscosity. Coal tar is among the by-products when coal is carbonized to make coke or gasified to make coal gas.

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

What is coal tar also known as when used in shampoo, ointment etc?

  1. Liquor carbonis detergens

  2. Solidified carbonis detergents

  3. Soldified coke detergents

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

Coal tar is also known as liquor carbonis detergents (LCD), and liquor picis carbonis  (LPC), can be used in medicated shampoo, soap and ointment, as a treatment for dandruff and psoriasis, as well as used to kill and repel head lice.

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

______ has the highest carbon purity and is used to manufacture energy.

  1. Petrol coke

  2. Calcinated coke

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Calcinated petcoke (CPC) has highest carbon purity and is used to manufacture aluminium, graphite electrodes, steel, titanium dioxide and other carbon consuming industries.

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

Why is foundry coke used in boilers and furnaces?

  1. Excellent insulator

  2. Excellent source of light

  3. Excellent source of heat

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Foundry coke is a type of hard coke which is used for the production of cast iron and ductile products. It is an excellent source of heat and therefore it is used in industrial boilers and furnaces.

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

Coal tar belongs to a class of drugs known as:

  1. aldehydes

  2. alcohols

  3. keratoplastics

  4. none of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coal tar belongs to a class of drugs known as keratoplastics. It works by causing the skin to shed dead cells from its top layer and slow down the growth of skin cells. This effect decreases scaling and dryness. Coal tar can also decrease itchiness from these skin conditions.