The process of destructive distillation of coal yields: MCQ with Answer and Explanation

The process of destructive distillation of coal yields:
A. Only methane
B. Coke, coal tar, and coal gas
C. Graphite
D. Petrol and diesel
Answer: Option B
Solution (By JKSSB Mock Tests)
Heating coal in the absence of air (destructive distillation) produces coke (solid residue, high carbon), coal tar (mixture of aromatic compounds), ammoniacal liquor, and coal gas (H₂, CH₄, CO). Coke is used in blast furnace. Coal tar is a source of aromatic chemicals and pitch. Coal gas was used for lighting historically.

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Practice More chemistry Questions

Question #1
The hardness of water that cannot be removed by boiling is called:
A. Alkalinity
B. Temporary hardness
C. Permanent hardness
D. Softness

Correct Answer: Option C


Explanation:
Permanent hardness is due to dissolved sulfates and chlorides of calcium and magnesium. Boiling does not remove it. It requires chemical treatment (washing soda, ion exchange) or distillation. Temporary hardness (bicarbonates) is removed by boiling.

This question belongs to: Science chemistry
Question #2
In the reaction 2SO₂ + O₂ → 2SO₃, the type of reaction is:
A. Decomposition
B. Displacement
C. Combination
D. Neutralization

Correct Answer: Option C


Explanation:
Two or more substances (SO₂ and O₂) combine to form a single product (SO₃). This is a combination reaction. It is also a redox reaction and is catalyzed by V₂O₅ in the Contact process for sulfuric acid. Decomposition is the opposite (breaking down). Displacement involves replacement of an element.

This question belongs to: Science chemistry
Question #3
In the reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which element is oxidized?
A. Al
B. None
C. O
D. Fe

Correct Answer: Option A


Explanation:
Aluminium goes from 0 to +3 oxidation state (Al → Al³⁺ + 3e⁻), so it is oxidized. Iron goes from +3 to 0 (Fe³⁺ + 3e⁻ → Fe), reduced. This is a thermite reaction, highly exothermic, used for welding. Al is the reducing agent, Fe₂O₃ is the oxidizing agent. Oxidation is loss of electrons.

This question belongs to: Science chemistry