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Question

I=He II= Ne III=Ar IV=Kr
Decreasing order of melting point of compound I-IV follows:

A
IV > III > II > I
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B
I > II > III > IV
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C
II > III > IV > I
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D
II > IV > III > I
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Solution

The correct option is A IV > III > II > I
Option (A) is correct.
Melting point increases down the group for noble gases from He to Rn.This is due to increase in atomic size, an atomic radius which leads to increase in interatomic forces thus results in an increased melting point.
Decreasing order of melting point of noble gases is as follows:
Rn>Xe>Kr>Ar>Ne>He

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