When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
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a
Which depends upon the amount of dust in air
b
Slightly lower than that when rain water is without thunderstorm
c
Slightly higher than that when the thunderstorm is not there
d
Uninfluenced by occurrence of thunderstorm
answer is B.
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Detailed Solution
Normal rain water has a pH value 5.6. Thunderstorm forms pH which after oxidation gives HNO3. Therefore, rain water accompanying thunderstorm has a pH lower than 5.6