Weakest van der Waals forces of attraction is seen in which of the following gases?
A
Xe
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B
Kr
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C
Ar
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D
Ne
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E
He
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Solution
The correct option is EHe Weakest van der Waals forces of attraction is seen in He. The strength of van der Waals forces is directly proportional to the atomic size. He is the smallest noble gas. Hence, it has weakest van der Waals forces.