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    				| 1. | 
                                    Which one of the following species does not exist ? (a) [SnCl6]3− (b) [GeCl6]2− (c) [SiCl6]2− (d) [CCl6]2− | 
                            
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Answer»  Correct option (d) [CCl6] 2− Explanation: Carbon atom cannot expand its valency shell due to non availability of 2d sub shell, so [CCl6]2− does not exist.  | 
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