Civil Engineering - Waste Water Engineering - Discussion

When the quantity of acids in the rain water is more than the average, then such rain is called 'Acid rain'.

We are aware that normally rainwater has a pH of 5.6. When the pH of the rainwater drops below 5.6, it is called acid rain.

Acid rain refers to how acid from the atmosphere is deposited on the earth’s surface.

Oxides of nitrogen and sulphur which are acidic can be blown by the wind along with solid particles in the atmosphere and finally settle down either on the ground as dry deposition or in water, fog and snow as wet deposition.

The average pH value of the acid rain is 4 to 5.

Lower the ph value higher the acidity.

So, among these 5 is the lowest.

The normal rainfall ph is 5.6 which is also known as unpolluted air.

Anything lower than 5.6, which is 5 or lower, as stated in the choices, is considered to be acidic for rain.

The rainfall is acidic when it's below 7.
Not 7.
7 is neutral.

Then answer is below 7,
It could be 6, 5, 6.5.

Actually, the standard value of pH for acid rain is 5.6.

The Rainfall PH is 5.6 to 6.5.

According to IS (Indian standard), 5.0 is the standard value. So, option C.5 is the correct answer.

Which is the Correct answer? Please explain.

For Acid rain pH 5.6.

For rain it is taken as 5. As per IS.