Question

Which of the following reactions are possible?

• A. $3Mg+2A{l}^{3+}\to 2Al+3M{g}^{2+}$
• B. $C{l}_2+2I^{-}\to I_2+2C{l}^{-}$
• C. $K^{+}+Na\to K+N{a}^{+}$
• D. $K+N\to K^{-}+N^{+}$

Answer 1

Answer: (A), (B)

The correct options are
A $C{l}_2+2I^{-}\to I_2+2C{l}^{-}$
B $3Mg+2A{l}^{3+}\to 2Al+3M{g}^{2+}$

From the table, it can be seen that as Mg has a higher oxidising potential than Al, it will have a higher tendency to get oxidised. This means that it will act a reducing agent:

$3Mg+2A{l}^{3+}\to 2Al+3M{g}^{2+}$

Similarly, chlorine has high reduction potential so it will oxidise iodide ion:

$C{l}_2+2I^{-}\to I_2+2C{l}^{-}$