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Which of the following is the weakest ba...

Which of the following is the weakest base:-

A

`NaOH`

B

`Zn(OH)_(2)`

C

`Ca(OH)_(2)`

D

`KOH`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given compounds is the weakest base among NaOH, Zn(OH)₂, Ca(OH)₂, and KOH, we can follow these steps: ### Step 1: Understand the Concept of Basicity Basicity refers to the ability of a substance to accept protons or donate hydroxide ions (OH⁻) in solution. A stronger base will dissociate more readily to produce OH⁻ ions. ### Step 2: Identify the Types of Hydroxides The compounds given are: - NaOH (Sodium Hydroxide) - Zn(OH)₂ (Zinc Hydroxide) - Ca(OH)₂ (Calcium Hydroxide) - KOH (Potassium Hydroxide) ### Step 3: Classify the Hydroxides - NaOH and KOH are alkali metal hydroxides (Group 1). - Ca(OH)₂ is an alkaline earth metal hydroxide (Group 2). - Zn(OH)₂ is a hydroxide of a transition metal (d-block). ### Step 4: Compare Basic Strengths 1. **Alkali Metal Hydroxides (NaOH and KOH)**: These are strong bases because they dissociate completely in water to produce OH⁻ ions. 2. **Alkaline Earth Metal Hydroxides (Ca(OH)₂)**: These are generally weaker bases than alkali metal hydroxides but stronger than transition metal hydroxides. 3. **Transition Metal Hydroxides (Zn(OH)₂)**: These are typically the weakest bases among the hydroxides listed because they do not dissociate as readily to produce OH⁻ ions. ### Step 5: Conclusion Based on the classification and comparison: - NaOH and KOH are strong bases. - Ca(OH)₂ is a weaker base than NaOH and KOH but stronger than Zn(OH)₂. - Zn(OH)₂ is the weakest base among the options provided. Thus, the weakest base among the given options is **Zn(OH)₂ (Zinc Hydroxide)**. ### Final Answer **Zinc Hydroxide (Zn(OH)₂) is the weakest base.** ---
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