Question

In the following reaction $NH _{4}^{+}+ BiN \rightarrow NH _{3}+ Bi ^{3+} NH _{4}^{+}$ is acting as an

• A. oxidising agent
• B. acid
• C. base
• D. catalyst

Answer 1

Answer: (B)

acid

Answer 2

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 $\left(H^{+}\right)$ 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.
$N H_{3}^{+}+B i N \rightarrow N H_{3}+B i^{3+}$
In this reaction $N H_{4}^{+}$ is acting as a proton donor,
therefore $N H_{4}^{+}$ is an acid.