IP1 and IP2 of Mg are 178 and 348K cal mol−1 respectively. The energy required for the reaction Mg→Mg2++2e− is:
A
+170K cal mol−1
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B
+526K cal mol−1
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C
−170K cal mol−1
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D
−526K cal mol−1
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Solution
The correct option is B+526K cal mol−1 Mg→Mg2++2e− The energy required in kcal mol−1 is the sum of the first ionization energy and the second ionization energy. Ip1+Ip2=178+348=+526K cal mol−1