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The electrons identified by quantum numb...

The electrons identified by quantum numbers n and l :-
(a) n=4, l=1 (b) n=4, l=0 (c ) n=3, l=2 (d) n=3, l=1
Can be placed in order of increasing energy as

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The correct Answer is:
`(b) lt (d) lt (a) lt (c )`
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