Which fossil fuel is found in association with petroleum deposits and is the cleanest burning?
A. Peat
B. Coal
C. Natural gas
D. Lignite
Answer: Option C
Solution (By JKSSB Mock Tests)
Natural gas (methane) is often found above petroleum deposits, trapped under cap rock. It burns cleaner than coal and oil, producing less CO₂, no SO₂, and minimal particulates. Coal (including lignite) contains more impurities. Peat is an early stage of coal. Natural gas is transported via pipelines or as LNG.
Explanation:
Hydrogen chloride is a polar covalent bond because the shared electron pair is unequally shared due to the higher electronegativity of chlorine (3.0) compared to hydrogen (2.1). The bond has a dipole moment, making HCl molecule polar. In water, HCl ionizes to H⁺ and Cl⁻, but the gaseous molecule is covalent. Pure ionic bonds exist in compounds like NaCl where electronegativity difference is large (>1.7).
Explanation:
Calcination is the process of heating a concentrated ore strongly in the absence or limited supply of air. It is typically used for carbonate ores to drive off volatile impurities like CO₂ and H₂O (e.g., CaCO₃ → CaO + CO₂). Roasting is done in the presence of excess air.
Explanation:
Oleum, also known as fuming sulfuric acid, is a solution of sulfur trioxide (SO3) in concentrated sulfuric acid (H2SO4). Its chemical formula is often represented as H2S2O7 (disulfuric acid or pyrosulfuric acid), which is essentially H2SO4 + SO3. It is an intermediate in the Contact process.
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