Carbon-14 is used in: MCQ with Answer and Explanation

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Carbon-14 is used in:

A. Generating nuclear power

B. Radiocarbon dating

C. Tracing blood clots

D. Treatment of cancer

Answer: Option B

Solution (By JKSSB Mock Tests)

Carbon-14 is a radioactive isotope of carbon with a half-life of about 5,730 years. It is continuously formed in the atmosphere and incorporated into living organisms. When the organism dies, C-14 decays. By measuring the remaining C-14, scientists can determine the age of archaeological and geological samples up to ~50,000 years old.

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Question #1

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Vulcanization of rubber involves heating with:

A. Carbon

B. Nitrogen

C. Sulfur

D. Oxygen

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Correct Answer: Option C

Explanation:
Vulcanization cross-links rubber polymer chains with sulfur bridges, improving elasticity, strength, and durability. Invented by Charles Goodyear. It converts raw rubber into useful form.

This question belongs to: Science chemistry

Question #2

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Which hydrocarbon has the molecular formula C₃H₈?

A. Ethane

B. Methane

C. Butane

D. Propane

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Correct Answer: Option D

Explanation:
Propane is an alkane with three carbon atoms: CH₃CH₂CH₃, formula C₃H₈. Methane: CH₄, Ethane: C₂H₆, Butane: C₄H₁₀. Propane is a component of LPG. Alkanes follow CnH₂n+2. For n=3, H=8. Propane is a gas at room temperature, liquefied under pressure. It is used as fuel for heating and cooking.

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Question #3

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Soap molecules form micelles in water. The hydrophilic part is:

A. The potassium ion

B. The entire molecule

C. The carboxylate head

D. The hydrocarbon tail

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Correct Answer: Option C

Explanation:
The head (–COO⁻) is ionic and attracted to water (hydrophilic). The long hydrocarbon tail is non-polar and hydrophobic, dissolving in grease. This amphiphilic nature allows cleaning.

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