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 contains more carbon
B. It is a liquid
C. It is more expensive
D. It produces less CO₂ and negligible particulate matter
Answer: Option D
Solution (By JKExamLibrary)
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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Question #1
Which element has the highest electronegativity?
A. Chlorine
B. Oxygen
C. Fluorine
D. Nitrogen

Correct Answer: Option C


Explanation:
Fluorine is the most electronegative element with a Pauling electronegativity of 3.98. Electronegativity increases across a period and decreases down a group. Thus, among the halogens, F > Cl > Br > I. Oxygen (3.44) is second. Electronegativity determines bond polarity. Because of its small size and high effective nuclear charge, fluorine strongly attracts bonding electrons. Noble gases are not assigned electronegativity values (except Kr, Xe).

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Question #2
The chemical name of baking soda is:
A. Sodium hydrogen carbonate
B. Calcium carbonate
C. Sodium carbonate
D. Potassium carbonate

Correct Answer: Option A


Explanation:
Baking soda is sodium hydrogen carbonate (NaHCO₃). It is used as a leavening agent in baking (produces CO₂ upon heating or with acid), as an antacid, and in fire extinguishers. Sodium carbonate (Na₂CO₃) is washing soda. Calcium carbonate is limestone/marble. Potassium carbonate is potash. Baking powder is a mixture of NaHCO₃ and a weak acid like tartaric acid.

This question belongs to: Science chemistry
Question #3
The process of separating cream from milk uses:
A. Centrifugation
B. Filtration
C. Sublimation
D. Distillation

Correct Answer: Option A


Explanation:
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