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In which of the following pairs of molecules/ions, both the species are not likely to exist ?

1. + 2 2 H , He 2
2. − 2 H , + 2 2 He
3. + 2 H , − 2 2 He
4. − 2 H , − 2 2 He

Correct answer: + 2 2 H , He 2

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