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The equation which is balanced and represents

Question:

The equation which is balanced and represents the correct product (s) is :

1. $\left[\mathrm{Mg}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}+(\mathrm{EDTA})^{4} \stackrel{\text { excess } \mathrm{NaOH}}{\longrightarrow}[\mathrm{Mg}(\mathrm{EDTA})]^{2+}+6 \mathrm{H}_{2} \mathrm{O}$

2. $\mathrm{CuSO}_{4}+4 \mathrm{KCN} \rightarrow \mathrm{K}_{2}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]+\mathrm{K}_{2} \mathrm{SO}_{4}$

3. $\mathrm{Li}_{2} \mathrm{O}+2 \mathrm{KCl} \rightarrow 2 \mathrm{LiCl}+\mathrm{K}_{2} \mathrm{O}$

4. $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{+}+5 \mathrm{H}^{+} \rightarrow \mathrm{Co}^{2+}+5 \mathrm{NH}_{4}^{+}+\mathrm{Cl}^{-}$

Correct Option: , 4

Solution:

Solution not required