Methane reacts with chlorine in the presence of sunlight to give:
A. Methanol
B. Methyl chloride and HCl
C. Carbon tetrachloride
D. Ethane
Answer: Option B
Solution (By JKSSB Mock Tests)
Methane undergoes substitution reaction with chlorine in UV light: CH₄ + Cl₂ → CH₃Cl + HCl. Further substitution can give CH₂Cl₂, CHCl₃, CCl₄. This is a free radical mechanism. It does not produce methanol or ethane.
Explanation:
NH₄Cl is from HCl (strong) and NH₄OH (weak). Its aqueous solution is acidic due to hydrolysis of NH₄⁺. NaCl is neutral (strong-strong). CH₃COONa basic (weak-strong).
Explanation:
Portland cement is made by heating a mixture of limestone (CaCO₃) and clay (SiO₂, Al₂O₃, Fe₂O₃) in a kiln. The resulting clinker is ground with gypsum. Soda ash and sand are for glass.
Explanation:
Stratospheric ozone absorbs harmful UV-B and UV-C radiation from the sun, protecting living organisms. Depletion by CFCs increases UV at surface. Infrared is absorbed by greenhouse gases.
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