Civil Engineering > GATE 2021 SET-1 > Environmental Engineering
Ammonia nitrogen is present in a given wastewater sample as the ammonium ion (NH4+) and ammonia (NH3). If pH is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement?
A
At pH above 9.25, only NH4+ will be present.
B
At pH below 9.25, NH3 will be predominant.
C
At pH 7.0, NH4+ and NH3 will be found in equal measures.
D
At pH 7.0, NH4+ will be predominant.

Correct : d

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