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Which of the following species is not stable?

1. [SiF6]2-
2. [GeCl6]2-
3. [Sn(OH)6]2-
4. [SiCl6]2-

Correct answer: [SiCl6]2-

Solution

The [SiCl6]2- ion is not stable because silicon cannot accommodate six large chloride ions around it due to steric hindrance and its relatively smaller size compared to fluorine. In contrast, [SiF6]2- is stable due to the smaller size of fluorine.

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