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(a)Why are the elements of group 18 know...

(a)Why are the elements of group `18` known as noble gases?
(b)Noble gases have very low boiling points why?
(c ) Does the hydrolysis of `XeF_(6)` lend in a redox reaction?

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Noble gases being monoatomic have no interatomic forces except weak dispersion forces and therefore, they are liquefied at very low temperatures. Hence, they have low boiling points.
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NCERT ENGLISH-THE P-BLOCK ELEMENTS-EXERCISE
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  6. How does ammonia react with a solution of Cu(2)^(+)?

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