CGPET 2012 Solved Paper

Section: Chemistry

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Question : 83 of 150

Marks: +1, -0

What is the electronic configuration of O2− ion?

1s2,2s2,2p5,3s1
1s2,2s2,2p4,3s2
1s2,2s2,2p6
1s2,2s2,2p4

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