Complete the reaction : `Zn + 2NaOH to`

Options

A. `Zn(OH)_(2) + H_(2)`
B. `Na_(2)ZnO_(2) + H_(2)`
C. `Zn(OH)_(2) + Na_(2)O`
D. `Na_(2)ZnO_(2) + Na_(2)O`

Explanation

To complete the reaction of zinc (Zn) with sodium hydroxide (NaOH), we follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are zinc (Zn) and sodium hydroxide (NaOH).

### Step 2: Understand the Reaction Type
When a metal reacts with a base, it typically produces a salt and hydrogen gas. In this case, zinc is the metal and sodium hydroxide is the base.

### Step 3: Write the Reaction
The reaction can be written as:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{?} \]

### Step 4: Determine the Products
From the reaction of zinc with sodium hydroxide, the products are:
1. Sodium zincate (Na₂ZnO₂)
2. Hydrogen gas (H₂)

Thus, the complete reaction is:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2 \]

### Step 5: Balance the Reaction
Now, we need to ensure that the reaction is balanced:
- Sodium (Na): 2 on the left and 2 on the right (balanced)
- Zinc (Zn): 1 on the left and 1 on the right (balanced)
- Oxygen (O): 2 on the left (from NaOH) and 2 on the right (from Na₂ZnO₂) (balanced)
- Hydrogen (H): 2 on the left (from NaOH) and 2 on the right (1 from H₂) (balanced)

The balanced reaction is:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2 \]

### Final Answer
The complete reaction is:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2 \]

---