Question

Strong base is

• A. NaOH
• B. NH\(_4\)OH
• C. Cu(OH)\(_2\)
• D. Al(OH)\(_3\)

Hint:

Sodium hydroxide (NaOH) is an example of a strong base because it dissociates completely in water, releasing a high concentration of hydroxide ions.

Answer 1

The Correct Option is A

Step 1: Understanding Strong Base
A strong base is a substance that completely dissociates in water to release hydroxide ions (\(OH^-\)). This leads to a high concentration of \(OH^-\) ions in solution.

Step 2: Identifying the Strong Base
Among the options, NaOH (sodium hydroxide) is a well-known strong base because it dissociates completely in water to produce \(OH^-\) ions.

Step 3: Why the Other Options Are Incorrect
- (B) NH\(_4\)OH (ammonium hydroxide) is a weak base because it does not dissociate completely in water.
- (C) Cu(OH)\(_2\) (copper(II) hydroxide) is a weak base and is only slightly soluble in water.
- (D) Al(OH)\(_3\) (aluminum hydroxide) is also a weak base because it is insoluble in water.
Thus, the correct answer is option (A) NaOH.