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Which of the following electronic configuration is not possible according to Hund's rule:
(1) 1s2 2s2
(2) 1s2 2s1
(3) 1s2 2s2 2p1x 2py1y 2p1x
(4) 1s2 2s2 2p2x
(5) 1s2 2s2 2p2x 2p1y 2p1z
Ans: 1s2 2s2 2p2x
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If molecular mass and atomic mass of sulphur are 256 and 32 respectively, its atomicity is: (1) 2 (2) 8 (3 )4 ( 4)16 Ans: 8
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