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Question

Which noble gas does not form clathrates?

A
Xe
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B
Kr
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C
He
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D
Ar
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Solution

The correct option is C He
He does not form clathrates due to its small size.
The essential condition for the formation of clathrates is that the guest (noble gas) atoms should be of appropriate size to fit in the cavities of the host crystal lattice; for instance, Ar, Kr, and Xe can form clathrates with crystalline β-quinol, but He and Ne cannot fit because they are too small.

Option C is correct.

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