question_answer

Which of the following reactions are not possible? (a) \[FeS{{O}_{4}}+Cu\xrightarrow{{}}CuS{{O}_{4}}+Fe\] (b) \[2KI+C{{l}_{2}}\xrightarrow{{}}2KCl+{{I}_{2}}\] (c) \[N{{a}_{2}}S{{O}_{4}}+2K\xrightarrow{{}}{{K}_{2}}S{{O}_{4}}+2Na\] (d) \[ZnS{{O}_{4}}+Fe\xrightarrow{{}}FeS{{O}_{4}}+Zn\]

Answer:

A more reactive metal always replaces a less reactive metal from its salt solution. (a)\[FeS{{O}_{4}}+Cu\to CuS{{O}_{4}}+Fe\to Not\,possible\] (b) \[2KI+K\to 2KCl+{{I}_{2}}\to Not\,possible\] (c)\[N{{a}_{2}}S{{O}_{4}}+K\to {{K}_{2}}S{{O}_{4}}+2Na\to Possible\] (d) \[ZnS{{O}_{4}}+Fe\to FeS{{O}_{4}}+Zn\to Possible\]