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Please answer the following question with explanation

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Asked by Deepak 24th September 2018, 8:13 PM
Answered by Expert
Answer:
[SiF6]2- is known while [SiCl6]2- is not known because,
 
1. Due to the small size of F, the steric repulsion will be very less in [SiF6]2- but in [SiCl6]2- the steric repulsion is high between Cl atoms which are large in size.
 
2. Also, the interaction of lone pairs of electrons of F with Si atom is stronger than that of the lone pair of Cl atom.
 
Therefore [SiF6]2- is known while [SiCl6]2- is not.
Answered by Expert 25th September 2018, 11:26 AM
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