Which of the following is a base according to Lowry-Bronsted concept?
Explanation for the correct option
B.
Explanation for the incorrect options:
A. Ammonium ion () can donate a proton to form ammonia (). Thus, it is an acid according to the Lowry-Bronsted concept.
C. Hydrochloric acid () can donate a proton. Thus, it is an acid according to the Lowry-Bronsted concept.
D. Hydronium ion () can donate a proton to form water (). Thus, it is an acid according to the Lowry-Bronsted concept.
Hence, the correct option is B.