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Chemical Properties of Noble Gases

Thermal stabi...

Question

Thermal stability of hydrates of group 18 elements :

A

increases down the group

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B

decreases down the group

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C

remains unchanged

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D

first increases up to Ar and then decreases

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Solution

The correct option is A increases down the group
When water is allowed to freeze in the presence of Ar, Kr or Xe under pressure, atoms of noble gas get trapped in the crystal lattice of ice giving clathrates corresponding to the composition, 8G.46H2O. These clathrates are also known as the noble gas hydrates.

Stability of hydrates increases down the group due to increase in polarisability.

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