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Which of the following order is correct with respect to the hydration enthalpy?(a) B > Mg > Ca < Sr > Ba(b) Be^+2 > Mg^+2 > Ca^+2 > Sr^+2 > Ba^+2(c) B > Mg < Ca > Sr > Ba(d) B > Mg > Ca > Sr < BaThe question was asked by my school principal while I was bunking the class.Asked question is from s-Block Elements topic in division s-Block Elements of Chemistry – Class 11

Answer»

The correct answer is (b) Be^+2 > Mg^+2 > Ca^+2 > Sr^+2 > Ba^+2

The best explanation: The hydration enthalpy decreases with the INCREASE in ionic size along with the group TOWARDS down, the correct ORDER of hydration enthalpy is GIVEN as Be^+2 > Mg^+2 > Ca^+2 > Sr^+2 > Ba^+2 and the hydration enthalpies of alkaline earth metal IONS are greater than the size of alkali metal ions. We can say that these are extensively hydrated than them.



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