ABC26IN0014 · Acids and Bases

Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acid and Bases – General · Exam: CSIR-NET JUNE 2019 · Marks: 2 · Difficulty: Medium

Among the following reactions, those that are feasible in liquid $\mathrm{NH_3}$ are
\[ \begin{array}{l} \text{(I) } \mathrm{KNO_3} + \mathrm{AgCl} \rightarrow \mathrm{KCl} + \mathrm{AgNO_3} \\ \text{(II) } \mathrm{NH_4Br} + \mathrm{KNH_2} \rightarrow \mathrm{KBr} + 2\mathrm{NH_3} \\ \text{(III) } \mathrm{Fe(CO)_5} + 2\mathrm{e^-} \rightarrow [\mathrm{Fe(CO)_4}]^{2-} + \mathrm{CO} \end{array} \]
(a)I, II and III
(b)I and II only
(c)I and III only
(d)II and III only
Answer
Answer (as printed): A
Explanation
When aqueous solution of $\mathrm{AgNO_3}$ is added to an aqueous solution of KCl, white ppt of $\mathrm{AgCl}$ is formed.
\[ \mathrm{KCl + AgNO_3 \rightarrow AgCl + KNO_3} \quad \text{(White ppt)} \]
But in liquid $\mathrm{NH_3}$, the direction of the reaction is reversed.
\[ \mathrm{AgCl + KNO_3 \rightarrow KCl + AgNO_3} \]
\[ \mathrm{NH_4Br + KNH_2 \rightarrow KBr + 2NH_3} \]
This reaction is neutralization reaction in liquid $\mathrm{NH_3}$ Ammonia solutions of alkali metals and alkaline earth metals are strong reducing agents.
\[ \mathrm{Fe(CO)_5 + 2e^{-} \rightarrow [Fe(CO)_4]^{2-} + CO} \]

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