Question

In the following reaction.
${\left[Cu{\left(H_{2}O\right)}_{3}OH\right]}^{+}+{\left[Al{\left(H_{2}O\right)}_6\right]}^{3+}⟶{\left[Cu{\left(H_{2}O\right)}_4\right]}^{2+}+{\left[Al{\left(H_{2}O\right)}_5\right(OH\left)\right]}^{2+}$
$\left(A\right)$ $\left(B\right)$ $\left(C\right)$ $\left(D\right)$

• A. $\left(A\right)$ is an acid and $\left(B\right)$ is a base
• B. $\left(A\right)$ is a base and $\left(B\right)$ is an acid
• C. $\left(C\right)$ is the conjugate acid of $\left(A\right)$ and $\left(D\right)$ is the conjugate base of $\left(B\right)$
• D. $\left(C\right)$ is the conjugate base of $\left(A\right)$ and $\left(D\right)$ is the conjugate acid of $\left(B\right)$

Answer 1

Answer: (B), (C)

The correct options are
B $\left(A\right)$ is a base and $\left(B\right)$ is an acid
C $\left(C\right)$ is the conjugate acid of $\left(A\right)$ and $\left(D\right)$ is the conjugate base of $\left(B\right)$

(A) acts as a base because it accepts $H^{+}$ ions donated by (B) so (B) acts as an acid.

Conjugate acid is the substance which is formed by reception of $H^{+}$ by base and Conjugate base is the substance which is formed by donation of $H^{+}$ by acid.

So (C) is the conjugate acid of (A) and (D) is the conjugate base of (B).