Civil Engineering - Waste Water Engineering - Discussion

18. 

A rainfall may be classified as acidic if its pH value is less or equal to

[A]. 6
[B]. 7
[C]. 5
[D]. 6.5

Answer: Option C

Explanation:

No answer description available for this question.

Tanupa said: (Aug 29, 2016)  
I think less than 7 is called acidic. Answer should be B.

Sumit said: (Sep 10, 2016)  
But according to Indian Standard. If pH is less than 5 then only it could be considered as acid rain.

Vijay said: (Oct 6, 2016)  
How it is?

Kartikey Tiwari said: (Oct 7, 2016)  
It's not 5. The actual answer is 5.6.

Baloch said: (Oct 30, 2016)  
pH=7 will be neutral.

Answer for acidic rain can be 5, 6, even 6.5.

Sujeet said: (Jan 11, 2017)  
Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic.
However, when rain combines with sulfur dioxide or nitrogen oxides "produced from power plants and automobiles" the rain becomes much more acidic.
Typical acid rain has a pH value of 4.0.

Swapnil Bhalekar said: (Feb 8, 2017)  
Thanks @Sujeet.

Harsha said: (Jul 29, 2017)  
You are right @Balloch.

Khan said: (Jan 27, 2018)  
Equal or less than 6, So, option A.

Viru Kapoor said: (Mar 26, 2018)  
For rain it is taken as 5. As per IS.

Dpk said: (Dec 8, 2018)  
For Acid rain pH 5.6.

Krishna said: (Feb 21, 2019)  
Which is the Correct answer? Please explain.

Tarundai said: (Mar 13, 2019)  
According to IS (Indian standard), 5.0 is the standard value. So, option C.5 is the correct answer.

Sushma said: (May 29, 2019)  
The Rainfall PH is 5.6 to 6.5.

Manish Rajput said: (Aug 19, 2020)  
Actually, the standard value of pH for acid rain is 5.6.

Yogesh Khairnar said: (Aug 23, 2020)  
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.

Mabin said: (Dec 24, 2020)  
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.

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