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2017 O Level Chem P1 Q32 — Metals / Reactivity with Acids Solution

Metals / Reactivity with Acids 2017 O Level Pure Chemistry · Paper 1 · Q32

Question

1.0 g of each of the metals calcium, iron, magnesium and zinc was placed in separate test-tubes, each containing excess dilute hydrochloric acid. The gas evolved from each test-tube was collected and its volume was measured. Which metal produced the greatest volume of gas on completion of the reaction?

Acalcium
Biron
Cmagnesium
Dzinc

Correct answer: C

Video Solution

Explanation

Answer: C. Each metal reacts with excess acid to give hydrogen, and all four metals are divalent, so the moles of hydrogen equal the moles of metal (\(1.0 \div A_r\)).

Magnesium has the smallest relative atomic mass (24), so 1.0 g is the greatest number of moles and produces the greatest volume of gas.

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