Question

$I$. The conjugate base of water is $H_3{O}^{+}$.
$II$. According to Bronsted-Lowry theory, bases are substances which are proton acceptors.

• A. Statement $I$ is true, Statement $II$ is true.
• B. Statement $I$ is true, Statement $II$ is false.
• C. Statement $I$ is false, Statement $II$ is true.
• D. Both Statement $I$ and Statement $II$ are false.

Answer 1

The correct option is D Both Statement $I$ and Statement $II$ are false.

When water reacts with base, it acts as an acid and gives proton to form its conjugate base which is $O{H}^{-}$

$\underset{Acid}{\underset{}{H_{2}O}}⟶H^{+}+\underset{Conjugatebase}{\underset{}{O{H}^{-}}}$

Hence, the conjugate base of water is $O{H}^{-}$.

According to Bronsted- lowry concept, a base is a proton acceptor.

Hence, statement $I$ is false, statement $II$ is true.