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Mr Chen's anecdotes.

Ngee Ann Secondary School 2021 Pure Chemistry Paper 2

This is the short summary of the Prelim Paper Review I've done for





My 3 matrices:


Relevance: 6/10

Insightfulness: 8.5/10

Difficulty: 8/10

Overall: 6/10

Expectation: 65%


Key questions to consider:


Question 5 - Qualitative Analysis, Mole Concept, Acid Base and Salt


Question 7 - Data analysis, Periodicity


Question 8 - Application of Electrolysis and Metals


Question 9EITHER - Application of Electrolysis


Short writeup:


2021 Ngee Ann Secondary School's Pure Chemistry Paper is a paper that will test students on application of concepts. Apart from the first 2 questions, the rest of the paper would require students to deliberate carefully before being able to attempt the question.


In addition, electrolysis is also the theme of the paper given that it was set in 2021, where COVID led to the removal of the common last topic of Organic Chemistry in the 2021 O levels exam. Hence, this paper is largely reserved for students who would like to attempt topical revision.


I generally use this paper with my students by cherry picking questions that are worthy of discussion and practice. It is a paper that is not the most relevant in terms of timed practice and hence, most students should only do it as a day-to-day practice of cherry picked questions.

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