Science (086) — AI-generated practice question

The gas produced is hydrogen (H₂).

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

Test for hydrogen gas: Bring a burning candle or a lighted matchstick near the mouth of the test tube collecting the gas. If the gas burns with a pop sound, it confirms the presence of hydrogen gas.

Source: Chapter 1, Section 1.1.2; Chapter 3, Section 3.2.3

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• 1 mark for naming the gas (hydrogen).
• 1 mark for the balanced chemical equation.
• 1 mark for the correct confirmatory test — examiners specifically want the pop sound detail; just saying "it burns" is incomplete and may lose the mark.
• Always write the equation with state symbols if you can, as it shows better understanding.