_______________ is a monoacidic base whereas _____________ is a diacidic base.

• A. KOH, Mg(OH)₂
• B. KOH, Fe(OH)₃
• C. Mg(OH)₂, KOH
• D. None of the above

In the context of acids and bases, a monoacidic base can donate one hydroxide ion (OH^-) per molecule, while a diacidic base can donate two hydroxide ions. Let's analyze the options provided:

Options Breakdown

• A. KOH, Mg(OH)₂: KOH is a monoacidic base because it can release one OH^- ion. Mg(OH)₂ is diacidic as it can release two OH^- ions.
• B. KOH, Fe(OH)₃: KOH is monoacidic, but Fe(OH)₃ is also a triacidic base, not diacidic, as it can release three OH^- ions.
• C. Mg(OH)₂, KOH: This is the reverse of option A, where Mg(OH)₂ is diacidic and KOH is monoacidic.
• D. None of the above: This option suggests that none of the previous statements are correct.

Correct Answer

The correct choice is A. KOH, Mg(OH)₂. KOH is a monoacidic base, and Mg(OH)₂ is a diacidic base.