O-LevelChemistryMetals & Reactivity5070/12 · Oct/Nov 2017 · Q141 Mark

In an experiment, 1 mol of powdered copper and 1 mol of powdered zinc are placed in a flask. Dilute acid, containing 1 mol of acid, is added to the flask. The flask is left until all the reactions, if any, are complete. Which diagram shows the result of the experiment?

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AFlask showing a colourless neutral solution with 1 mol of copper solid.

BFlask showing a blue neutral solution with 0.5 mol of copper and 0.5 mol of zinc solids.

CFlask showing a blue neutral solution with 1 mol of zinc solid.

DFlask showing a colourless acidic solution with 1 mol of copper and 1 mol of zinc solids.

✓ Correct answer

A: Flask showing a colourless neutral solution with 1 mol of copper solid.

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2017 Paper 1 Variant 2, question 14.

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