Which of the following are true about pure rain water?

1.It is naturally acidic

2.It is naturally basic

3.It is neutral (neither acidic nor basic)

4.It's pH value is 7

5.It is called as acid rain when pH becomes less than 5.6

A1 & 5 only ✓ Correct

B3 & 4 only

C2 only

D3 & 5 only

Correct answer: (A) 1 & 5 only

Explanation

Pure rain water is naturally slightly acidic, and rain is termed acid rain when its pH drops below about five point six.

Statement 1 is true, since dissolved carbon dioxide forms weak carbonic acid making rain mildly acidic.

Statement 2 is false, as rain is not naturally basic.

Statement 3 is false, because rain is not neutral but mildly acidic.

Statement 4 is false, since its natural pH is near five point six rather than seven.

Statement 5 is true, because acid rain is defined by a pH below five point six.

Sulphur and nitrogen oxides from burning fuels push rainfall well below this acid threshold.

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