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In which test tube both water and air are present ? 

Electronic configurations of some elements are : 

Which of the above is a noble gas ?

(i) 1s2 2s2 2p6 3s2 3p

(ii) 1s2 2s2 2p3s2 3p6

(iii) 1s2s2 2p6 3s2 3p4 

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Element (ii).

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