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In the reaction,
Cr3+(aq) + 6H2O -------> [Cr(H2O)6]3+(aq)
Cr3+ IS THE LEWIS ACID H2O is the Lewis base.
A Lewis acid is a compound or chemical that accepts a lone pair of electrons. In the above equation, Cr3+ is accepting the lone pair of electrons.

Answer:The Lewis acid the in the given reaction is [tex]Cr^{3+}[/tex] ion.

Explanation:

According Lewis Theory of  acid base concept:

  • Acids are those who accepts pair of electron pair
  • Bases are those who donates pair of electron pair.

[tex]Cr^{3+}(aq)+6H_2O(aq)\rightleftharpoons Cr(H2O)_{6}^{3+}(aq)[/tex]

In the above reaction chromium (III) ion is acting as a Lewis acid and water is acting as Lewis base. Chromium ion easily accepts the electron pair that is lone pair of oxygen atom present in water molecule.

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