Tag: study of coal

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

Naphthalene balls used to repel moths and other insects are obtained from X. These days Y, a petroleum product, is used in place of X for metalling the roads. What are X and Y respectably?

  1. Coke, coal

  2. Coal, coke

  3. Bitumen, coal tar

  4. Coal tar, bitumen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Napthalene balls used to repel moth and other insects are also obtained from coal tar. These days Bitumen, a petroleum product is used in place of coal tar for metalling roads. The gases present in coal gas are combustible.

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

The residue left behind after the dry distillation of coal _____________.

  1. coal tar

  2. coal gas

  3. coke

  4. ammonia liquor
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When substances of vegetable origin, e.g. coal, oil shale, peat or wood, are heated in the absence of air (dry distillation), they decompose into gas, liquid products and solid residue coke/charcoal.

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

The fractional distillation of coal tar yields:

  1. carbon disulphide

  2. carbon tetrachloride

  3. kerosene oil

  4. benzene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Coal tar is the destructive distillation of bituminous coal. Coal tar is distilled into many fractions to yield a number of useful organic products like benzene, toluene, xylene, naphthalene, anthracene, etc.

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

Which of the following contains methane, hydrogen and carbon dioxide?

  1. Producer gas

  2. Water gas

  3. Coal gas

  4. Bio gas
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Generally coal mine and coal gas contain Carbon monoxide, carbon dioxide, methane, oxygen, nitrogen, hydrogen, and other hydrocarbons.

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

Which one of the following substances can be used both as a fuel and a reducing agent?

  1. Coke

  2. Wood

  3. Methane

  4. Methyl alcohol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coke can be used both as a fuel and a reducing agent. The combustion of coke (carbon) is highly exothermic and releases a huge amount of energy. Hence, coke is a fuel. Carbon itself is easily oxidized to $CO$ and $CO _2$. $C$ can easily reduce several metal oxides to metal.

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

When steam is passed over hot coke, it produces:

  1. producer synthesis gas

  2. synthesis gas

  3. tear gas

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

Syngas or synthesis gas is a fuel gas mixture consisting primarily of H, CO and very small carbon dioxide. The reaction between coke and steam is highly endothermic and when the coke bed is cooled to a normal temperature the steam is replaced by a blast of air.

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

Coal tar has an _________ smell.

  1. unpleasant

  2. pleasant

  3. Both (a) & (b)

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

Coal tars are complex and variable mixtures of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds. Hence have unpleasant smell.

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

Which gas is produced when steam is passed over red hot coke?

  1. Producer gas

  2. CNG

  3. Water gas

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

Synthesis gas is made by passing steam over a red-hot carbon fuel such as coke, Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas
$ H _2O + C\rightarrow  CO + H _2(\delta H = +131KJ/mol)$
Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.

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

When steam is passed over hot coke, it produces:

  1. producer gas

  2. synthesis gas

  3. tear gas

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

Synthesis gas is made by passing steam over a red-hot carbon fuel such as coke:
$H _2O + C \rightarrow  H _2  + CO ( \delta H =+131KJ/mol) $
Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning