The process of breaking down large hydrocarbon molecules into smaller, more useful ones by heating is called: MCQ with Answer and Explanation

The process of breaking down large hydrocarbon molecules into smaller, more useful ones by heating is called:
A. Cracking
B. Polymerization
C. Alkylation
D. Reforming
Answer: Option A
Solution (By JKExamLibrary)
Cracking is a petrochemical process where complex, heavy hydrocarbon molecules are broken down (cleaved) into lighter, more valuable molecules like gasoline and alkenes. This is achieved by applying high temperatures and pressures, often in the presence of a catalyst (catalytic cracking).

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Practice More chemistry Questions

Question #1
Enzymes are specific in action because:
A. They are proteins
B. They are biocatalysts
C. They are sensitive to pH
D. Their active site has a specific shape fitting the substrate

Correct Answer: Option D


Explanation:
The 'lock-and-key' model explains enzyme specificity: the substrate fits into the active site like a key in a lock. Protein nature is general; specificity arises from 3D structure.

This question belongs to: Science chemistry
Question #2
Assertion (A): Silver and gold occur in the free state in nature. Reason (R): They are highly reactive metals.
A. A is false but R is true.
B. Both A and R are true and R is the correct explanation of A.
C. A is true but R is false.
D. Both A and R are true but R is NOT the correct explanation of A.

Correct Answer: Option C


Explanation:
Silver and gold are noble metals and occur in the free (native) state in nature because they are extremely unreactive (least reactive), not highly reactive. They do not readily combine with oxygen, moisture, or acids. Thus, A is true, but R is false.

This question belongs to: Science chemistry
Question #3
Which of the following non-metals is lustrous?
A. Sulphur
B. Carbon
C. Iodine
D. Phosphorus

Correct Answer: Option C


Explanation:
Luster is a characteristic physical property of metals, but some non-metals also exhibit a shiny appearance. Iodine is a non-metal that forms dark purple, lustrous crystalline solids. Sulphur is dull yellow, phosphorus is white/red and waxy, and carbon (as graphite/coal) is generally dull.

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