Choose the correct balanced chemical equations to show the reactions of the following:
Caustic soda solution and zinc oxide.

Options

A. `ZnO + 2NaOH rarr Na_(2)ZnO_(2) + H_(2)O`
B. `Zn + 2NaOH rarr Na_(2)ZnO_(2) + H_(2)O`
C. `Zn + 2NaOH rarr Na_(2)ZnO + H_(2)`
D. `Zn + NaOH rarr Na_(2)ZnO_(2) + H_(2)`

Explanation

To solve the problem of balancing the chemical equation for the reaction between caustic soda solution (sodium hydroxide, NaOH) and zinc oxide (ZnO), we will follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are:
- Caustic soda solution: NaOH
- Zinc oxide: ZnO

### Step 2: Understand the Reaction Type
Zinc oxide (ZnO) is amphoteric, meaning it can react with both acids and bases. In this case, it will react with the base (NaOH) to form a zincate ion.

### Step 3: Write the Unbalanced Equation
The unbalanced chemical equation for the reaction can be written as:
\[ \text{ZnO} + \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2\text{O} \]

### Step 4: Determine the Products
When zinc oxide reacts with sodium hydroxide, it forms sodium zincate and water. The products are:
- Sodium zincate: Na₂ZnO₂
- Water: H₂O

### Step 5: Balance the Equation
Now, we need to balance the equation. The balanced equation will be:
\[ \text{ZnO} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2\text{O} \]

### Step 6: Verify the Balancing
Now, let's verify that the equation is balanced:
- **Zinc (Zn)**: 1 on both sides
- **Sodium (Na)**: 2 on both sides
- **Oxygen (O)**: 3 on both sides (2 from Na₂ZnO₂ and 1 from H₂O)
- **Hydrogen (H)**: 2 on both sides

Since all elements are balanced, the equation is correct.

### Final Balanced Equation
The final balanced equation for the reaction of caustic soda solution with zinc oxide is:
\[ \text{ZnO} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2\text{O} \]

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