When rain is accompanied by a thunderstorm, the collected rain water will have a $\mathrm{pH}$ value

When rain is accompanied by a thunderstorm, the collected rain water will have a $\mathrm{pH}$ value
  1. slightly higher than that when the thunderstorm is not there
  2. uninfluenced by occurence of thunderstorm
  3. which depends on the amount of dust in air
  4. slightly lower than that of rain water without thunderstorm

Solution

The rain water after thunderstorm contains dissolved acid and therefore the $\mathrm{pH}$ is less than rain water without thunderstorm.

Asked in: JEE Main 2003

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