Answer in one or two paragraph- Give reasons why? i.) LPG burns immediately on coming in contact with a matchstick while coal takes time. ii.) If we keep a paper cup on flame, it will burn , but, if we take some water in the paper cup, it will not burn even on putting on fire.
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lpg has methane as the main constituent which has low ignition temperature so it burns readily on coming in contact to matchstick
the question for second answer is because combustion needs oxygen which is not supplied when we take water in the paper cup
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