Correct Answer: NH₄OH (Ammonium Hydroxide)
Subject: chemistry
Explanation: • <b>Key Fact</b> Ammonium hydroxide (NH₄OH) is a weak base because it only partially ionizes in water. • <b>Supporting Detail</b> Strong bases completely ionize in water, yielding a high concentration of OH⁻ ions. • <b>Related Concept</b> Sodium Hydroxide (NaOH) and Potassium Hydroxide (KOH) are classic examples of strong bases. • <b>Why wrong options are wrong</b> Calcium hydroxide is also considered a strong base/alkali compared to ammonia. • <b>Exam Trick</b> Alkali metals (Group 1) form the strongest bases. Ammonium is not a metal. • <b>Additional Info</b> Magnesium hydroxide, Mg(OH)₂, is also a weak base, famously used safely as an antacid.
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