The purest form of water is
1). tap water
2). rainwater
3). groundwater
4). distilled water
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1. Muddy water is treated with alum in purification process, it is termed as :
2. Highest percentage of carbon is found in which form of coal?
3. Iodized salt is beneficial for
4. An example of heterocyclic compound is
7. The chemical name of "laughing gas is