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Which statement about the industrial extraction of metals from their ores is correct?
See it on the paper →Which metal can be obtained by passing hydrogen over its heated metal oxide?
See it on the paper →Complete the balanced chemical equation.
See it on the paper →Identify the reducing agent in this extraction. Explain your answer. reducing agent explanation
See it on the paper →Barrier methods are used to prevent iron from rusting. State one barrier method and explain how it prevents rusting. method explanation
See it on the paper →Those candidates that understood that carbon dioxide had been produced usually also correctly balanced the equation. There were a few candidates that incorrectly stated the formula as CO3 or CO4.
— Examiner report, October/November 2022, 0653/43 Q5(a)(i) (Cambridge)
Candidates seemed to struggle with the term ‘reducing agent’. Many candidates thought the answer was iron or iron oxide, confusing reducing agent with the substance being reduced.
— Examiner report, October/November 2022, 0653/43 Q5(a)(ii) (Cambridge)
This was answered very well by many candidates who wrote detailed explanations which specified that the iron had to be protected from contact with oxygen and/or water. Air was not accepted as an alternative to oxygen.
— Examiner report, May/June 2022, 0653/43 Q2(e)(ii) (Cambridge)
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