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GCE O Level 2011 Oct/Nov Chemistry 5072 (MCQ) Paper 1 Suggested Answers & Solutions

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Tuition given in the topic of Little Miss Loi the Science Tutor (archived) from the desk of Little Miss Loi at 9:23 am (Singapore time)

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Another morning, another booklet, another series of codes sent:

Q1-10CDDAA CBDBA
Q11-20BABDA DAADB
Q21-30BADBD ADDDA
Q31-40CDBCB ABCCA

Note: After staring long and hard at the ang moh anomaly that is Q22, I’ve decided to change its answer to A. Reason being that scrap steel, containing a higher percentage (98%) of iron, will lead to a better yield and reduce mining wastes when iron is produced from it via recycling. The highlighted portion would definitely qualify as a correct reason if only it had been included in the original statement – instead of sparking intense debates like this 🙁

Do they tally with yours?

Update: Once again, the list of workings and explanations for each of the answers (where applicable) have been compiled (along with the questions at the end)!

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GCE O Level 2011 Chemistry 5072 Paper 1 solutions

2011 O-Level October/November Chemistry 5072 Paper 1 Suggested Solutions

As usual, hopefully this will help in some way to settle some of the debates regarding some of the answers (and hopefully not create more in the process!)

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