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(a) Among group 18 elements, only Xe can...

(a) Among group 18 elements, only Xe can from compounds. Explain.
(b) Arrange the followings in order of increasing their basicity:
`NH_3 , AsH_3 , SbH_3 ,PH_3`

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(a) This is because Xe has large size and low ionisation energy.
(b) The increasing order of basic value is
`SbH_3 lt AsH_3 lt PH_3 lt NH_3`
This is because charge density increases.
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