Question

Calcium hydroxide is a

• A. weak acid
• B. weak base
• C. strong acid
• D. strong base

Answer 1

The correct option is B

weak base

The explanation for the correct option- (B) Weak base

Weak bases - The bases which partly ionise and release a few numbers of hydroxyl ions when dissolved in water are called weak bases.

For example - Ammonium hydroxide$\left({\mathrm{NH}}_4\mathrm{OH}\right)$.

The explanation for the incorrect options-

(A) Weak acids - The acids which do not completely ionise in water and produce only a few hydrogen ions are called weak acids.

For example - Phosphoric acid$\left({\mathrm{H}}_3{\mathrm{PO}}_4\right)$.

(C) Strong acids - The acids which completely ionise and produce a large number of hydrogen ions in water are called strong acids.

For example - Hydrochloric acid$\left(\mathrm{HCl}\right)$

(D) Strong base - The bases which completely ionise and release a large number of hydroxyl ions when dissolved in water are called strong bases.

For example - Sodium hydroxide$\left(\mathrm{NaOH}\right)$.

Hence, option (B) is correct. Calcium hydroxide is a weak base.