The main constituent of CNG is: MCQ with Answer and Explanation

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The main constituent of CNG is:

A. Propane

B. Ethane

C. Butane

D. Methane

Answer: Option D

Solution (By JKExamLibrary)

CNG (Compressed Natural Gas) is primarily methane (CH₄). LPG is propane and butane. Methane is the lightest hydrocarbon. CNG is a cleaner fuel for vehicles.

This question belongs to: Science chemistry

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Question #1

LPG has an added odorant (ethyl mercaptan) to:

A. Improve engine performance

B. Reduce combustion temperature

C. Increase calorific value

D. Detect leakage

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Correct Answer: Option D

Explanation:
LPG (propane/butane) is odorless. A small amount of strong-smelling mercaptan (ethanethiol) is added to help detect gas leaks, preventing accidents. Natural gas also has odorant. Mercaptans contain sulfur, and their smell is detectable at very low concentrations. Calorific value, temperature, performance are unaffected. Safety is primary.

This question belongs to: Science chemistry

Question #2

Assertion (A): Boiling water removes temporary hardness. Reason (R): Boiling converts soluble bicarbonates into insoluble carbonates.

A. Both A and R are true but R is NOT the correct explanation of A.

B. A is false but R is true.

C. Both A and R are true and R is the correct explanation of A.

D. A is true but R is false.

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Correct Answer: Option C

Explanation:
Temporary hardness is due to Ca(HCO₃)₂ and Mg(HCO₃)₂. Upon boiling, these decompose into insoluble CaCO₃ and Mg(OH)₂, which precipitate out and can be filtered. Thus, boiling effectively removes temporary hardness, and R correctly explains the chemical mechanism involved.

This question belongs to: Science chemistry

Question #3

In the reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which element is oxidized?

A. O

B. None

C. Al

D. Fe

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Correct Answer: Option C

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

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