Methane on complete combustion with excess oxygen yields:
A. CO and H₂O
B. CO₂ and H₂O
C. C and H₂O
D. CO₂ and H₂
Answer: Option B
Solution (By JKSSB Mock Tests)
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:
Plaster of Paris (CaSO₄·½H₂O) reacts with water to form gypsum (CaSO₄·2H₂O) which sets into a hard solid mass with slight expansion. Reaction: CaSO₄·½H₂O + 1½H₂O → CaSO₄·2H₂O. This property is used for casting and setting broken bones.
Explanation:
Vinegar is a 4-8% solution of acetic acid (CH₃COOH) in water. Formic acid is in ant sting, citric in citrus fruits, lactic in curd. Acetic acid is used as preservative and condiment.
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