A student took some zinc granules a test tube and added dilute hydrochloric acid to it. A colourless, odourless gas X was evolved .The gas X is:

Options

A. Hydrogen
B. Oxygen
C. Carbon dioxide
D. Nitrogen dioxide

Explanation

To solve the question, we need to analyze the reaction between zinc granules and dilute hydrochloric acid (HCl). Here’s a step-by-step breakdown:

### Step 1: Identify the Reactants
The reactants in this scenario are zinc granules (Zn) and dilute hydrochloric acid (HCl).

### Step 2: Write the Chemical Reaction
When zinc reacts with hydrochloric acid, the chemical reaction can be represented as:
\[ \text{Zn (s)} + 2 \text{HCl (aq)} \rightarrow \text{ZnCl}_2 (aq) + \text{H}_2 (g) \]

### Step 3: Identify the Products
From the reaction, we can see that the products formed are zinc chloride (ZnCl₂) and hydrogen gas (H₂).

### Step 4: Analyze the Gas Produced
The problem states that a colorless, odorless gas X is evolved. From the reaction, we see that the gas produced is hydrogen (H₂), which is indeed colorless and odorless.

### Step 5: Conclusion
Therefore, the gas X that is evolved when zinc granules are added to dilute hydrochloric acid is hydrogen gas (H₂).

### Final Answer
The gas X is: **Hydrogen (H₂)**.

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