NCERT/CBSE CHEMISTRY CLASS 11 textbook
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Solutions/Answers to NCERT/CBSE CHEMISTRY Class 11(Class XI)textbook
CHAPTER TEN
The s-Block Elements
10.29 How would you explain the following observations?
(i)
. BeO is almost insoluble but BeSO4 in soluble in water: -The lattice enthalpy of BeO
is higher than its hydration enthalpy; therefore BeO is insoluble in water. On the
other hand the lattice enthalpy of BeSO4 is lower than its hydration enthalpy,
therefore BeSO4 is soluble in water
(ii) BaO is soluble but BaSO4 is insoluble in water:- The lattice enthalpy of BaO is less than
its hydration enthalpy, because of the large size of Ba ions and smaller size of the oxide ion.
Therefore BaO is soluble in water. On the other hand in BaSO4 the size of Ba ions and sulphate
ions are very large and therefore the lattice enthalpy is much larger than the hydration enthalpy.
Therefore BaSO4 is insoluble in water.
(iii) LiI is more soluble than KI in ethanol:- LiI has a covalent character because Li ion has
high polarizing power due to its small size. Therefore LiI is soluble in alcohol. On the other
hand KI is predominantly an ionic compound, therefore is insoluble in ethanol.
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