Aluminium is `"………….."` in nature and dissolves in both dilute hydrochloric acid and sodium hydroxide evolving `"………….."` gas.

Answer

To fill in the blanks in the question regarding aluminum, we can follow these steps:

### Step 1: Identify the Nature of Aluminum
Aluminum is known to be **amphoteric** in nature. This means it can react with both acids and bases.

### Step 2: Reaction with Dilute Hydrochloric Acid
When aluminum reacts with dilute hydrochloric acid (HCl), it produces aluminum chloride and hydrogen gas. The reaction can be represented as:
\[ 2 \text{Al} + 6 \text{HCl} \rightarrow 2 \text{AlCl}_3 + 3 \text{H}_2 \]
From this reaction, we see that hydrogen gas (H₂) is evolved.

### Step 3: Reaction with Sodium Hydroxide
When aluminum reacts with sodium hydroxide (NaOH), it forms sodium aluminate and also evolves hydrogen gas. The reaction can be represented as:
\[ 2 \text{Al} + 2 \text{NaOH} + 6 \text{H}_2\text{O} \rightarrow 2 \text{NaAlO}_2 + 3 \text{H}_2 \]
Again, hydrogen gas (H₂) is produced.

### Final Answer
Thus, the complete statement is:
"Aluminum is **amphoteric** in nature and dissolves in both dilute hydrochloric acid and sodium hydroxide evolving **hydrogen** gas."