Statement-1: Hydrogen gas is liberated by the action of aluminium with a concentrated solution of NaOH
Statement-2: Aluminium with NaOH forms sodium metaaluminate.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanantion of the assertion, then mark (2)
C. If assertion is true statements but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the given question, we need to analyze both statements and determine their validity.

### Step 1: Analyze Statement 1
**Statement 1:** "Hydrogen gas is liberated by the action of aluminium with a concentrated solution of NaOH."

- When aluminium (Al) reacts with sodium hydroxide (NaOH), it undergoes a chemical reaction that produces hydrogen gas (H₂) and sodium meta-aluminate (NaAlO₂).
- The balanced chemical equation for this reaction can be represented as:

\[ 2 \text{Al} + 2 \text{NaOH} + 2 \text{H}_2\text{O} \rightarrow 2 \text{NaAlO}_2 + 3 \text{H}_2 \]

- From this equation, we can see that hydrogen gas is indeed liberated during the reaction.

**Conclusion for Statement 1:** True

### Step 2: Analyze Statement 2
**Statement 2:** "Aluminium with NaOH forms sodium meta-aluminate."

- As derived from the balanced equation above, when aluminium reacts with sodium hydroxide, sodium meta-aluminate (NaAlO₂) is formed.
- This confirms that the reaction does produce sodium meta-aluminate as one of the products.

**Conclusion for Statement 2:** True

### Step 3: Determine the Relationship Between the Statements
- Both statements are true. However, we need to determine if Statement 2 is the correct explanation for Statement 1.
- While Statement 2 correctly describes a product of the reaction, the liberation of hydrogen gas is not solely due to the formation of sodium meta-aluminate. Instead, it is a characteristic of the reaction of amphoteric metals (like aluminium) with alkalis.

**Final Conclusion:**
- Both statements are true, but Statement 2 does not serve as the correct explanation for Statement 1.

### Final Answer:
The correct option is: **Assertion and reason are true, but the reason is not the correct explanation of the assertion.**

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