Science — AI-generated practice question

(a) Reaction of Zinc Granules with Dilute Sulphuric Acid

Labelled Diagram:

```
Zn granules
|
______[Test tube]______
| Dilute H₂SO₄ |
|_____________________|
|
Gas evolved (H₂) → collected / tested with burning splint
```

(Diagram should show a test tube containing zinc granules and dilute H₂SO₄, with a delivery tube/mouth for gas collection.)

Balanced Chemical Equation:

$$\text{Zn}(s) + \text{H}_2\text{SO}_4(aq) \rightarrow \text{ZnSO}_4(aq) + \text{H}_2(g)$$

Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. Bubbles are observed, and the zinc granules dissolve.

Test for the Gas:
Bring a burning splint near the mouth of the test tube. The gas burns with a pop sound, confirming it is hydrogen gas.

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(b) General Summary Equation — Metal + Acid:

$$\text{Metal} + \text{Acid} \rightarrow \text{Salt} + \text{Hydrogen gas}$$

Source: Chapter 1 – Chemical Reactions and Equations, Section 1.1.2

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• The diagram is worth marks — label clearly: test tube, zinc granules, dilute H₂SO₄, and the gas outlet.
• Write the balanced equation with state symbols for full marks; this equation is already balanced (1:1:1:1 ratio).
• The "pop sound" with a burning splint is the standard CBSE accepted test for hydrogen — don't just say "it burns."
• For part (b), the general equation (Metal + Acid → Salt + Hydrogen) is a direct textbook statement; write it exactly.