HARDMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesAchiever Section
IE1 and IE2 of Mg(g) are 178 and 348 kcal mol–1 respectively. The energy required for the reaction Mg (g) ® Mg²⁺ (g) + 2e– is
A.+ 170 kcal
B.+ 526 kcal✓ Correct
C.– 170 kcal
D.– 525 kcal
Explanation
1 2 Overall energy = IE + IE =178 Kcal/mole + 348 Kcal/mole =526 Kcal/mole
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