CNG is considered a cleaner fuel than petrol because it produces:
A. Less CO₂ and negligible particulate matter
B. Sulfur dioxide
C. More oxides of nitrogen
D. More CO₂
Answer: Option A
Solution (By JKSSB Mock Tests)
CNG (methane) has a higher H/C ratio, so combustion produces less CO₂ per unit energy compared to petrol/diesel. It also burns completely without generating smoke or particulate matter, and contains no sulfur, thus no SO₂. It reduces NOx and unburned hydrocarbons. It is used in vehicles and is safer in spills because it is lighter than air and disperses quickly.
Explanation:
Rate ∝ 1/√M. Molar masses: CO₂=44, SO₂=64, CH₄=16, Cl₂=71. Methane has the smallest molar mass, so it diffuses fastest. Graham's law applies.
Explanation:
BOD stands for Biological Oxygen Demand. It is a measure of the amount of dissolved oxygen required by microorganisms to decompose the organic matter present in a water sample. High BOD indicates severe organic pollution and poor water quality for aquatic life.
Explanation:
Nickel (finely divided) catalyzes the addition of hydrogen to unsaturated vegetable oils to form solid vanaspati ghee. It provides surface for reaction. Platinum and palladium also work but are expensive. Iron is used in Haber process. V₂O₅ in Contact process.
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