The 'ozone hole' is most prominent over Antarctica during spring due to unique polar stratospheric clouds and CFC accumulation. Arctic ozone depletion also occurs but is less severe.
Explanation:
Sodium reacts vigorously with moisture and oxygen in air, so it is stored under kerosene to prevent contact. Potassium, lithium are similarly stored. Iron, zinc, copper do not require such storage.
Explanation:
CNG (Compressed Natural Gas) is primarily methane (CH₄). LPG is propane and butane. Methane is the lightest hydrocarbon. CNG is a cleaner fuel for vehicles.
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