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In which of the following pairs of molecules/ions, the species are not likely to exist ?
- H2+, He2−
- H2, He2−
- H2+, He2
- H2, He2+
Correct answer: H2+, He2
Solution
H2+ is a stable molecular ion formed from hydrogen, while He2− is not likely to exist because helium is a noble gas with a complete electron shell, making it unlikely to form a stable anion.
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