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Q.

Ionization energy of Al = 5137 kJ mol-1 (∆H) hydration of Al3+ = - 4665 kJ mol-1. (∆H)hydration for Cl-=-381 kJ mol-1. Which of the following statement is correct.

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a

AlCl3 would remain covalent in aqueous solution

b

Only at infinite dilution AICl3 undergoes ionization

c

In aqueous solution AlCl3 becomes ionic

d

None of these

answer is C.

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Detailed Solution

If AlCl3 is present in ionic state in aqueous solution, therefore it has Al3+ and 3Cl- ions Standard heat of hydration of A13+ and 3Cl- ions = - 4665 + 3× (-381) kJ mol-1= -5808 kJ/molRequired energy of ionization of Al = 5 137 kJ mol-1 ..'. Hydration energy overcomes ionization energy .'. AlCl3 would be ionic in aqueous solution

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Ionization energy of Al = 5137 kJ mol-1 (∆H) hydration of Al3+ = - 4665 kJ mol-1. (∆H)hydration for Cl-=-381 kJ mol-1. Which of the following statement is correct.