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The pH of water sample collected from a ...

The pH of water sample collected from a river was found to be acidic in the range of 3.5 - 4.5. On the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water ?

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Lead battery contains lead and sulphuric acid as its components. The acid contaminates river water lowering the pH from 7 to 3.5 - 4.5.
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