Ammonia nitrogen is present in a given wastewater sample as the ammonium ion (NH 4 + ) and ammonia (NH 3 ). If pH is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement?

Correct Answer is : At pH 7.0, NH4+ will be predominant.

At pH 7.0, NH4+ will be predominant.

At pH below 9.25, NH 3 will be predominant.

At pH below 7.0 NH4+ and NH3 will be found in equal measures

At pH 9.25, only NH4+ will be present

GATE Civil Engineering (CE) 2021 Shift 1 Solved Paper

Question : 44 of 65

Marks: +1, -0

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?

At pH 7.0, NH4+ will be predominant.
At pH below 9.25, NH₃ will be predominant.
At pH below 7.0 NH4+ and NH3 will be found in equal measures
At pH 9.25, only NH4+ will be present

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