Methane on complete combustion with excess oxygen yields:
A. C and H₂O
B. CO and H₂O
C. CO₂ and H₂
D. CO₂ and H₂O
Answer: Option D
Solution (By JKExamLibrary)
CH₄ + 2O₂ → CO₂ + 2H₂O + heat. Complete combustion of any hydrocarbon with sufficient oxygen always produces carbon dioxide and water. Incomplete combustion due to limited oxygen produces carbon monoxide (CO) and/or soot (carbon particles). Methane is the main component of natural gas and biogas. CO is a poisonous gas. The combustion of alkanes is highly exothermic.
Explanation:
Aluminium is highly reactive; its oxide cannot be reduced by carbon. Hall-Héroult process electrolyzes alumina dissolved in molten cryolite (Na₃AlF₆) using carbon anodes.
Explanation:
Zinc coating (galvanizing) provides both barrier and sacrificial protection. Even if scratched, zinc corrodes instead of iron because it is more reactive.
Explanation:
Inert electrodes do not participate in the chemical reaction; they merely provide a surface for electron transfer. Platinum and graphite are common inert electrodes. Copper, zinc, and silver are active electrodes and can dissolve or deposit during electrolysis, thereby participating in the chemical change.
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