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How many pairs are, in which first speci...

How many pairs are, in which first species has lower ionisation enegy than second species:
(i) N and O
(ii) Br and K
(iii) Be and B
(iv) I and `I^(-)`
(V) Li and `Li^(+)`
(vi) and O and S
(vii) Ba and Sr.

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Verified by Experts

The correct Answer is:
2
(v) `Li lt Li^(+)`
(vii) `Ba lt Sr`
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