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Which of the following metal ions will have maximum number of unpaired electrons:
(1) Fe+2
(2) Co+2
(3) Ni+2
(4) Mn+2
Ans: Mn+2
The present atomic weight scale is based on: (1) C 12 (2) O 16 (3) H 1 (4)C 13 Ans: C 12
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