2018 O Level Chem P1 Q30 — Metals / Reactions of Metals with Steam Solution
Question
In the experiment shown, steam is passed over a heated solid P. Gas Q is collected. What are substances P and Q?
Correct answer: D
Video Solution
Explanation
Answer: D (P = zinc, Q = hydrogen). Only a metal above hydrogen in the reactivity series reacts with steam, giving the metal oxide and hydrogen gas.
Of the options, copper, lead and silver are all below hydrogen and do not react. Zinc is above hydrogen and reacts: \(\text{Zn} + \text{H}_2\text{O} \rightarrow \text{ZnO} + \text{H}_2\).
The gas Q is hydrogen, which is insoluble in water and so is collected over water. P is zinc. Answer D.
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