First slide

Atomic and physical properties

Question

Statement 1: ${AlCl}_{3}$ ionises in solution.
Statement 2: The hydration energy of ${AlCl}_{3}$ exceeds the ionization energy.

Difficult

A

Both statements 1 and 2 are correct
B

Statement 1 is correct and statement 2 is incorrect
C

Statement 1 is incorrect and statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

Ionization energy required to convert $Al to {Al}^{3 +} is 5137 kJ {mol}^{- 1} . {ΔH}_{hydration} for {Al}^{3 +} is - 4665 kJ {mol}^{- 1} and {ΔH}_{hydration}$ $for {Cl}^{-} is - 381 kJ {mol}^{- 1} .$ So total hydration energy $- 4665 + (3 \times - 381) = - 5808 kJ {mol}^{- 1}$ is greater than ionization energy.

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