CNG is considered a cleaner fuel than diesel because: MCQ with Answer and Explanation

CNG is considered a cleaner fuel than diesel because:
A. It produces less CO₂ and negligible particulate matter
B. It is a liquid
C. It is more expensive
D. It contains more carbon
Answer: Option A
Solution (By JKSSB Mock Tests)
CNG (mainly methane) has a higher H/C ratio than diesel, so it emits less CO₂ per unit energy. It burns almost completely, producing very little carbon monoxide, unburnt hydrocarbons, and particulate matter (soot). It also contains negligible sulfur, thus no SO₂ emissions.

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Practice More chemistry Questions

Question #1
Hard water can be softened by adding washing soda because it:
A. Increases pH
B. Removes chlorine
C. Kills bacteria
D. Precipitates calcium and magnesium ions as carbonates

Correct Answer: Option D


Explanation:
Na₂CO₃ reacts with Ca²⁺/Mg²⁺ to form insoluble CaCO₃/MgCO₃, which are removed. This is permanent hardness removal. Boiling works for temporary hardness. Ion exchange is another method.

This question belongs to: Science chemistry
Question #2
PVC stands for:
A. Polyvinyl chloride
B. Polyvinyl carbide
C. Polyvinyl chlorate
D. Polyvinyl carbon

Correct Answer: Option A


Explanation:
PVC (polyvinyl chloride) is a polymer of vinyl chloride (CH₂=CHCl). It is used in pipes, electrical insulation, and flooring. It can be rigid (uPVC) or flexible with plasticizers. It is a thermoplastic. Chlorate/carbon/carbide are not correct expansions.

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Question #3
The rate of effusion of two gases A and B are equal. Which is true?
A. Molar mass of A = Molar mass of B
B. They are the same gas
C. Pressure must be different
D. Temperature must be different

Correct Answer: Option A


Explanation:
Graham's law: r ∝ 1/√M. If rA = rB, then MA = MB (at same T,P). Different gases can have same molar mass (e.g., N₂ and CO both 28).

This question belongs to: Science chemistry