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Tap water contains salt solution where as salt is good conductor of elctricity for example. tke a three cupa and fill them with water aplly salt in one beaker nd veneger in another beaker nd lemon in another beaker nd take to conecting with led now put conecting wires in ech of them u can observe tht both vineger nd lemon show poor condutor wheeaas sailt glows so hence it is proved
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