A) oxidising agent
B) acid
C) base
D) catalyst
Correct Answer: B
Solution :
Oxidising agent The substance (atom, ion or molecule) that gains electrons and is thereby reduced to a low valency state is called an oxidising agent. Acid and base According to Bronsted-Lowry concept An acid is denned as a substance which has the tendency to give a proton \[({{H}^{+}})\] and a base is defined as a substance which has a tendency to accept a proton. Catalyst Catalyst is a substance which speeds up and speed downs a chemical reaction, without itself being used up. \[NH_{3}^{+}+BiN\xrightarrow{{}}N{{H}_{3}}+B{{i}^{3+}}\] In this reaction \[NH_{4}^{+}\] is acting as a proton donor, therefore \[NH_{4}^{+}\] is an acid.
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