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Hydroxide of which metal is soluble in s...

Hydroxide of which metal is soluble in sodium hydroxide solution?

A

Magnesium

B

Lead

C

Silver

D

Copper

Text Solution

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The correct Answer is:
To determine which metal hydroxide is soluble in sodium hydroxide (NaOH) solution, we need to analyze the behavior of the hydroxides of the given metals: Magnesium (Mg), Lead (Pb), Silver (Ag), and Copper (Cu). ### Step-by-Step Solution: 1. **Understanding Metal Hydroxides**: - Metal hydroxides can either be soluble or insoluble in sodium hydroxide solution. Solubility often depends on the ability of the hydroxide to form stable complexes with hydroxide ions (OH⁻). 2. **Analyzing Each Metal Hydroxide**: - **Magnesium Hydroxide (Mg(OH)₂)**: - Magnesium hydroxide is generally insoluble in sodium hydroxide. It does not form stable complexes with hydroxide ions. - **Lead Hydroxide (Pb(OH)₂)**: - Lead hydroxide can dissolve in sodium hydroxide. It can form a complex ion, specifically Pb(OH)₄²⁻, which indicates its solubility in NaOH. - **Silver Hydroxide (AgOH)**: - Silver hydroxide is also insoluble in sodium hydroxide. It does not form stable complexes with hydroxide ions. - **Copper Hydroxide (Cu(OH)₂)**: - Copper hydroxide is similarly insoluble in sodium hydroxide and does not form stable complexes. 3. **Conclusion**: - Among the options provided, only Lead hydroxide (Pb(OH)₂) is soluble in sodium hydroxide solution due to its ability to form a stable complex with hydroxide ions. ### Final Answer: The hydroxide of the metal that is soluble in sodium hydroxide solution is **Lead (Pb)**.
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