CNG is considered a cleaner fuel than petrol because it produces:
A. Sulfur dioxide
B. More oxides of nitrogen
C. Less CO₂ and negligible particulate matter
D. More CO₂
Answer: Option C
Solution (By JKExamLibrary)
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:
In diamond, each carbon atom is sp³ hybridized and forms four strong covalent bonds, utilizing all four valence electrons. No free electrons are available for conduction. Graphite has free delocalized electrons per carbon, making it a conductor.
Explanation:
CaOCl₂ + 2HCl (dil.) → CaCl₂ + Cl₂ + H₂O. It also releases Cl₂ on reaction with CO₂ in air: CaOCl₂ + CO₂ → CaCO₃ + Cl₂. Water alone hydrolyses it slowly. NaOH does not release Cl₂. The chlorine gas is responsible for bleaching and disinfection.
Explanation:
Biogas is produced from anaerobic digestion of organic waste (cow dung, agricultural residue) and is renewable. Mainly methane and CO₂. Coal, petroleum, and natural gas are fossil fuels formed over millions of years, non-renewable. Biogas plants generate clean fuel and also produce enriched manure. Charcoal is also not a fossil fuel; it's from wood pyrolysis.
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