Conductivity MP BP and Electronegativity (Group 2)
From the give...
Question
From the given data, heat of hydration (numerical value) of LiCl, NaCl and KCl in the increasing order is :
A
LiCl<KCl<NaCl
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B
LiCl<NaCl<KCl
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C
LiCl=KCl<NaCl
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D
KCl<NaCl<LiCl
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Solution
The correct option is DKCl<NaCl<LiCl As hydration energy is proportional to 1/cation size and as we move down the group, size increases so heat of hydration decreases. ΔHHydration=ΔHhydration(cation)+ΔHhydration(anion) And order is KCl < NaCl < LiCl