Among the following, tri acidic base is

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HCOOH

${NH}_{4} OH$

$Mg (OH)_{2}$

$Al (OH)_{3}$

answer is D.

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Detailed Solution

Acidity of a base:

Mono acidic base :

A base which produces one hydroxyl ion by the ionization of one molecule of the base, is called as mono acidic base.

Ex: NaOH, KOH, NH₄OH

Diacidic base:
A base which produces two hydroxyl ion by the ionization of one molecule of the base, is called as diacidic base.
Ex: $Ca (OH)_{2}, Mg (OH)_{2}, Cu (OH)_{2}, Zn (OH)_{2}, Fe (OH)_{2}$
Tri acidic base:
A base which produces three hydroxyl ions by the ionization of one molecule of the base is called a triacidic base.
Ex: $Fe (OH)_{3}, Al (OH)_{3}, Cr (OH)_{3}$