Urea is a fertilizer that provides: MCQ with Answer and Explanation

Explanation:
In this reaction, chlorine (oxidation state 0) reacts with hot, concentrated NaOH. It forms NaCl where Cl is -1 (reduction) and NaClO3 where Cl is +5 (oxidation). Since the same element, chlorine, is both oxidized and reduced, it undergoes a disproportionation reaction.

Explanation:
Liquefied Petroleum Gas (LPG) consists primarily of propane (C₃H₈) and butane (C₄H₁₀) liquefied under pressure. A strong-smelling mercaptan is added as odorant to detect leaks. CNG is mainly methane. LPG is used for cooking and as automotive fuel (autogas). It has higher calorific value than natural gas. It is heavier than air, so it settles in low areas, posing a safety hazard if leaked.

Explanation:
Incomplete combustion due to insufficient oxygen produces carbon monoxide (CO) and/or soot (C). Complete combustion gives CO₂ and H₂O. CO is poisonous, binds to hemoglobin.