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प्रश्न
The pH of a sample of water collected from a river is found to be in the range of 3.5 to 4.5. The most likely reason for this is the waste being discharged into the river from a :
(a) soap and detergent manufacturing factory
(b) car battery manufacturing factory
(c) alcohol manufacturing factory
(d) plastic cups moulding factory
उत्तर
(b) car battery manufacturing factory
Such factories produce acidic wastes that make the river water acidic.
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