4AB › Chemistry PYQ › CSIR-NET › June 2019 › Q2Q2 · CSIR-NET Chemistry, June 2019 Paper: CSIR-NET June 2019 · Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acid and Bases – General · 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: A ✓ checked by 4AB · confidence high
Explanation In liquid NH₃ KCl is insoluble while AgCl dissolves (ammine formation), so the metathesis I runs; II is the NH₄⁺/NH₂⁻ neutralisation of the solvent system; III is the Na/NH₃ reduction of Fe(CO)₅ to [Fe(CO)₄]²⁻. All three (a).
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