(a) Give one example of a metal which: (i) can displace hydrogen from cold water (ii) at red-heat, reacts reversibly with steam (iii) does not react with di...
Question 1 Report
(a) Give one example of a metal which:
(i) can displace hydrogen from cold water
(ii) at red-heat, reacts reversibly with steam
(iii) does not react with dilute hydrochloric acid
(b) When dry hydrogen was passed over lead (II) oxide, a greyish solid J was obtained.
(i) Identify J
(ii) What type of reaction was involved in the formation of J from lead (II) oxide?
Answer Details
(a)(i) Metal that displaces hydrogen from cold water: sodium (or potassium, calcium).
(ii) Metal that reacts reversibly with steam at red heat: iron (3Fe + 4H2O ⇌ Fe3O4 + 4H2).
(iii) Metal that does not react with dilute hydrochloric acid: copper (or silver, gold).
(b) Passing dry hydrogen over lead(II) oxide gives a greyish solid J.
(i) J is lead (Pb). (ii) The reaction is a reduction (redox); the hydrogen reduces PbO to Pb: PbO + H2 → Pb + H2O.
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