Assertion: Aluminium and zinc metal evolve `H_(2)` gas from NaOH solution
Reason: Several non-metals such as P,S,Cl, etc. yield a hydride instead of `H_(2)` gas from NaOH

Options

A. If both (A) and (R) are true and (R) is the correct explanation of (A)
B. if both (A) and (R) are true but (R) is not correct explanation of (A)
C. If (A) is true but (R) is false
D. If (A) is false but (R) is false

Explanation

To solve the assertion-reason question, let's break it down step by step.

### Step 1: Analyze the Assertion
The assertion states that "Aluminium and zinc metal evolve H₂ gas from NaOH solution."

**Explanation:**
- Both aluminum (Al) and zinc (Zn) are amphoteric metals. This means they can react with both acids and bases.
- When aluminum reacts with sodium hydroxide (NaOH), it forms sodium aluminate and releases hydrogen gas:
\[ 2 \text{Al} + 2 \text{NaOH} + 6 \text{H}_2\text{O} \rightarrow 2 \text{NaAl(OH)}_4 + 3 \text{H}_2 \uparrow \]
- Similarly, zinc reacts with NaOH to form sodium zincate and also releases hydrogen gas:
\[ \text{Zn} + 2 \text{NaOH} \rightarrow \text{Na}_2\text{Zn(OH)}_4 + \text{H}_2 \uparrow \]
- Therefore, the assertion is **true**.

### Step 2: Analyze the Reason
The reason states that "Several non-metals such as P, S, Cl, etc. yield a hydride instead of H₂ gas from NaOH."

**Explanation:**
- Non-metals like phosphorus (P), sulfur (S), and chlorine (Cl) do not produce hydrogen gas when reacting with NaOH.
- For example:
- Phosphorus reacts with NaOH to form sodium hypophosphite and phosphine gas:
\[ \text{P} + 3 \text{NaOH} + 3 \text{H}_2\text{O} \rightarrow \text{NaH}_2\text{PO}_2 + \text{PH}_3 \uparrow \]
- Sulfur reacts with NaOH to form sodium thiosulfate and other products:
\[ 4 \text{S} + 6 \text{NaOH} \rightarrow \text{Na}_2\text{S}_2\text{O}_3 + \text{Na}_2\text{S} + 3 \text{H}_2\text{O} \]
- Chlorine reacts with NaOH to produce sodium hypochlorite and other products:
\[ \text{Cl}_2 + 2 \text{NaOH} \rightarrow \text{NaCl} + \text{NaClO} + \text{H}_2\text{O} \]
- Therefore, the reason is also **true**.

### Step 3: Determine the Relationship
Now we need to determine if the reason is the correct explanation of the assertion.

- The assertion is about metals (Al and Zn) evolving hydrogen gas from NaOH.
- The reason discusses non-metals yielding hydrides instead of hydrogen gas from NaOH.
- There is no direct connection between the two statements; the behavior of metals does not explain the behavior of non-metals.

### Conclusion
Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.

**Final Answer: Option B** - Both assertion and reason are true, but reason is not the correct explanation of assertion.

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