Chemistry · PYQ NEET UG 2019(1)

Which of the following species is NOT stable?

1. \( [\text{GeCl}_6]^{2-} \)
2. \( [\text{Sn(OH)}_6]^{2-} \)
3. \( [\text{SiCl}_6]^{2-} \)
4. \( [\text{SiF}_6]^{2-} \)