First slide

Atomic & physical properties

Question

Which one of the following species cannot exist

Easy

A

${SnCl}_{6}^{- 2}$
B

${PbF}_{4}$
C

${SiCl}_{6}^{- 2}$
D

${PbI}_{2}$

Solution

${SiCl}_{6}^{- 2}$ cannot exist because small ${Si}^{+ 4}$ cannot accomodate six large ${Cl}^{-}$ ions around it. The bond is weak;.

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