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a
between 6 and 7
b
between 7 and 9
c
below 5-6
d
above 9
answer is C.
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Detailed Solution
Acid rain is due to dissolved acidic oxides of sulphur, nitrogen and carbon. Oxides of sulphur and nitrogen are strong acids, hence pH is below 7. A pH of below 5.6 is specific for acid rain.