Question

Assertion: Solution of $ AlC{{l}_{3}} $ in water is neutral.
Reason: $ {{\left[ Al{{\left( {{H}_{2}}O \right)}_{6}} \right]}^{3+}} $ is formed.
(A) Both assertion and reason are correct and reason is the correct explanation for assertion.
(B) Both assertion and reason are the correct reason is not the correct explanation for assertion.
(C) Assertion is correct but reason is incorrect
(D) Assertion is incorrect but reason is correct.
(E) Both assertion and reason are incorrect.

Answer 1

Hint: We know that as we know that the criteria for a substance to be an acid or a base are a topic of discussion among scientists for years. Roulle said that bases taste bitter, that they possess soapy and detergent properties. And Boyle said that acids taste sour and also change colour of the litmus from blue to red.

Complete step by step solution:
As we know that aluminium belongs to the third period in the periodic table, hence it has vacant 3d orbitals, where it can accept electrons. And as $ AlC{{l}_{3}} $ can accept electrons and form the anions, hence we can say that it acts as a Lewis acid. We can see the reaction:
 $ AlC{{l}_{3}}+C{{l}^{-}}\to AlCl_{4}^{-} $
As we know that aluminium is a strong electrophile, as there is presence of chlorine atoms that are high electron negative atoms which is found to reduce the electron density from the central atom. $ HCl~ $ is a strong acid, so it will dissociate in water to form $ {{H}^{+}}. $ As a result of this reaction, the solution will be acidic, with a $ pH\text{ }<\text{ }7. $
Therefore, reaction isn’t neutral; $ AlC{{l}_{3}}+3{{H}_{2}}O\to Al{{(OH)}_{3}}+HCl $ , thus correct answer is option D i.e. Assertion is incorrect but reason is correct.

Note:
Remember that we should note that the definition given by Lewis is applicable for those reactions in which no transference of hydrogen and other ions takes place and no ions are formed. For a more in-depth look, Antimatter is the opposite of normal matter. More specifically the sub-atomic particles of antimatter have properties opposite those of normal matter.