Periodic Classification and Periodic Properties 2 Question 29
29. Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because
(1989, 1M)
(a) the hydration energy of sodium sulphate is more than its lattice energy
(b) the lattice energy of barium sulphate is more than its hydration energy
(c) the lattice energy has no role to play in solubility
(d) the hydration energy of sodium sulphate is less than its lattice energy
Assertion and Reason
Read the following questions and answer as per the direction given below :
(a) Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
(b) Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
(c) Statement I is true; Statement II is false.
(d) Statement I is false; Statement II is true.
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Answer:
Correct Answer: 29. (d)
Solution:
- (a) Correct For greater solubility, hydration energy must be greater than lattice energy.
(b) Correct Greater lattice energy discourage dissolution of a salt.
(c) Incorrect When a salt dissolve, energy is required to break the lattice, which comes from hydration process.
(d) Incorrect Explained in (A).
