A small amount of sodium hydroxide solution is added to a small pieces of granulated zinc metal in a test tube. Which of the following represent correct equation?

Options

A. `Zn_((s))+NaOHtoNa_(2)ZnO_(2)+H_(2)`
B. `Zn_((s))+NaOHtoZn(OH)_(2)+NaOH`
C. `ZnO+NaOHtoNa_(2)ZnO_(2)+H_(2)`
D. `Zn+NaOHto` No reaction

Explanation

To solve the question regarding the reaction between sodium hydroxide (NaOH) and zinc (Zn), we will follow these steps:

### Step 1: Identify the Reactants
We have two reactants:
- Sodium hydroxide (NaOH)
- Zinc metal (Zn)

### Step 2: Understand the Reaction Type
This is a displacement reaction where a metal reacts with an alkali (base). In this case, zinc will displace hydrogen from sodium hydroxide.

### Step 3: Write the Initial Reaction
The initial reaction can be represented as:
\[ \text{Zn} + \text{NaOH} \]

### Step 4: Determine the Products
When zinc reacts with sodium hydroxide, it forms sodium zincate and hydrogen gas. The balanced chemical equation for this reaction is:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2 \uparrow \]

### Step 5: Final Equation
Thus, the correct equation representing the reaction is:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2 \]

### Summary
The correct representation of the reaction when sodium hydroxide is added to zinc metal is:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2 \]

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