Which given pair metals can be dissolves in `NaOH` solution ?

Options

A. Al , Cu
B. Zn , Al
C. Zn , Cu
D. Zn , Hg

Answer

To determine which pair of metals can dissolve in sodium hydroxide (NaOH) solution, we will analyze the reactivity of various metals with NaOH.

### Step 1: Identify metals that react with NaOH
Some metals that can react with sodium hydroxide include:
- Zinc (Zn)
- Aluminium (Al)

### Step 2: Write the reactions for the metals with NaOH
1. **Zinc with NaOH**:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2 \]
In this reaction, zinc reacts with sodium hydroxide to form sodium zincate and hydrogen gas.

2. **Aluminium with NaOH**:
\[ \text{2Al} + 2 \text{NaOH} + 6 \text{H}_2\text{O} \rightarrow 2 \text{NaAl(OH)}_4 \]
Here, aluminium reacts with sodium hydroxide and water to form sodium aluminate.

### Step 3: Conclusion
From the reactions above, we can conclude that both zinc and aluminium can dissolve in sodium hydroxide solution. Therefore, the correct answer is the pair of metals: **Zinc and Aluminium**.

### Final Answer
The pair of metals that can dissolve in NaOH solution is **Zinc and Aluminium**.

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