Paheli had heard that rainwater is as good as distilled water. So she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reasons?
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As rain drops fall through the air, they may dissolve ions present in air or forming acids on reaction with acidic oxides present in air, etc. This makes it a conducting solution. There are no dissolved salts present in the distilled water. Hence, rain water can allow electricity to pass through It while distilled water cannot.