NEET 2010 Chemistry question
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
Answer: (2)
Solution
The solubility of an ionic salt depends on the competition between lattice enthalpy and hydration enthalpy; a salt dissolves readily when hydration enthalpy exceeds lattice enthalpy. In alkaline earth sulphates the lattice enthalpy remains almost constant down the group because the large ion
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