Arrange the following increasing order of Hydration energyBe++, Mg++, Ca++, Ba++, Si++
Correct answer: C. Ba++ < Si++ < Ca++ < Mg++ < Be++
- A. Be++ < Mg++ < Ca++ < Ba++ < Si++
- B. Si++ < Ba++ < Ca++ < Mg++ < Be++
- C. Ba++ < Si++ < Ca++ < Mg++ < Be++
- D. Ba++ < Si++ < Mg++ < Ca++ < Be++
Explanation
Hydration energy is inversely related to the size of the cation. Smaller cations have higher hydration energy because they can attract water molecules more strongly. Among the given cations, Be++ is the smallest, followed by Mg++, Ca++, and Ba++. Si++ is not usually considered because silicon does not commonly form a +2 cation in aqueous solution, but if included, it would be larger than Be++ and Mg++. Therefore, the correct order is Ba++ < Si++ < Ca++ < Mg++ < Be++. The other options are incorrect as they do not correctly reflect the relationship between cation size and hydration energy.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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