First slide

Salt hydrolysis :

Question

Statement I : ${[Al {(H_{2} O)}_{6}]}^{3 +}$ is a stronger acid than ${[Mg {(H_{2} O)}_{6}]}^{+ 2}$

Statement II : Size of ${[Al {(H_{2} O)}_{6}]}^{3 +}$ smaller than ${[Mg {(H_{2} O)}_{6}]}^{+ 2}$ and posses more effective nuclear charge.

Moderate

A

Statement I and II are correct
B

Statement I is correct and Statement II is incorrect
C

Statement - I is incorrect and Statement II correct
D

Both statement - I and statement - II are False

Solution

${[Al {(H_{2} O)}_{6}]}^{+ 3}$ is stronger acid than ${[Mg {(H_{2} O)}_{6}]}^{+ 2}$ as ${[Al {(H_{2} O)}_{6}]}^{+ 3}$ under goes hydrolysis to yield
${[Al (OH) {(H_{2} O)}_{5}]}^{+ 2}$ and H₃O⁺. Hydrolysis occurs due to small size of Al⁺³, which polarises the lone pair of H₂O due to which it releases a proton.

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