Asked by Karishma | 1st Oct, 2014, 09:09: PM

Expert Answer:

In case of multiple questions within a query, please post each question individually and let us know where you are getting stuck so that we would be able to explain things better.
Solution for your first query,
Second ionisation enthalpy is the amount of energy required to remove the second most loosely bound electron from the isolated gaseous atom in its ground state.
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Answered by Prachi Sawant | 2nd Oct, 2014, 10:05: AM