TS EAMCET · Chemistry · p Block Elements (Group 13 & 14)

When aluminium chloride is dissolved in water, it gives

A ${[Al {(OH)}_{6}]}^{3 -} + 3 HCl$
B ${Al}_{2} O_{3} + 6 HCl$
C ${[Al {(H_{2} O)}_{6}]}^{3 +} + 3 {Cl}^{-}$
D ${Al}^{3 +} + 3 {Cl}^{-}$

Verified Solution

Answer & Solution

Correct Answer

(C) ${[Al {(H_{2} O)}_{6}]}^{3 +} + 3 {Cl}^{-}$

Step-by-step Solution

Detailed explanation

In trivalent state most of the compounds being covalent are hydrolysed in water. For example, the trichlorides on hyrolysis in water form tetrahedral MOH4- species; the hybridisation state of element M is sp3. Aluminium chloride in acidified aqueous solution forms octahedral…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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