Which of the given pairs exist in free states?

H & He

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Ar & O

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Ne & N

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He & Ne

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Solution

The correct option is D He & Ne
All noble gases can exist in free states.
a. In this option, He can exist in free state but H cannot
b. In this, Ar can exist in free state but O cannot
c. In this, Ne can exist in free state but N cannot
d. In this both He and Ne are noble gases and exist in free states.

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