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In Dewar's process coconut charcoal at 9...

In Dewar's process coconut charcoal at 93K is used to separate the two noble gases with atomic No. s X & Y then `(X + Y ) /4 =`_________

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The correct Answer is:
3
`(2 + 10 )/ 4 = 3 ""_2H,_10Ne`
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