A) \[F{{e}_{2}}{{O}_{3}}+6HCl\to 2FeC{{l}_{3}}+3{{H}_{2}}O\]
B) \[N{{H}_{3}}+{{H}_{2}}O+NaCl\to N{{H}_{4}}Cl+NaOH\]
C) \[SnC{{l}_{4}}+HgC{{l}_{2}}\to SnC{{l}_{2}}+2HgC{{l}_{2}}\]
D) \[2Cul+{{I}_{2}}+4{{K}^{+}}\to 2C{{u}^{2+}}+4KI\]
Correct Answer: A
Solution :
[a] Acid-base reactions occur spontaneously.
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