O Level Chemistry & IP Chemistry Notes by 10 Year Series Author – Chemistry Specialist

O Level Chemistry – Mini Series on Tough MCQs Part 3

For those local students that did not do well for the O Level Chemistry Paper 2 on Oct 20th, do not be discouraged because there is one more chance for you to UP your Chemistry Grades.

You still have your Chemistry Paper 1 (Multiple Choice Questions) Exams in 19 days time. There is more than enough time for your to re-learn and re-fine your Chemistry Concepts and earn high marks for it.

There are 40 marks for you to bag in Chemistry Paper 1 and weightage is as high as 30%!

But there is one problem i usually see. Students tends to let off their guards and relax before the Paper 1 because:

1. Chemistry Paper 1 is the last paper of GCE O Level Exams and students already in “holiday mood”

2. Many students feel that?Paper 1 (MCQs) is very easy .i.e relax mood….just go there select choices

They are certainly wrong about this. MCQs is the one that truly tests you on your concepts and applications.

In Paper 2 (Written Theory), questions are usually phrased and linked from one part to another, to help you to get some marks here and there.

But in Paper 1 (MCQs), you will score only either when you know the concepts really well and know how to apply, or when you are lucky. For me, i don’t believe in luck – i prefer to control my own destiny.

Now, that is the reason you see me starting this Mini Series on Tough MCQs.

And for those that wish to score an A1 for overall Chemistry Exams, i can assure you that MCQs will ultimately determine whether you get an A1 or A2! Trust me on that cause i have been through that, just like hundreds of students that i have coached before.

Below are sets of Exam-based MCQs for you to try:

Question 1:
When crystals of copper(II) sulphate are heated, the color changes from blue to white. This is caused by:
A. loss of water only
B. loss of water and sulphur trioxide
C. loss of water, sulphur dioxide and oxygen
D. reaction with carbon dioxide in the air
E. reaction with water vapour in the air

Question 2:
Which of the following salts can be crystallized from aqueous solution?
A. barium sulphate
B. calcium carbonate
C. potassium nitrate
D. silver chloride
E. zinc carbonate

Question 3:
Which one of the following hydroxides does not give a good yield of a salt with dilute sulphuric acid?
A. Iron(II) hydroxide
B. Magnesium hydroxide
C. Zinc hydroxide
D. Calcium hydroxide
E. Copper(II) hydroxide

PS: Do try it out and leave your comments below. Suggested answers will come in with reasonings.

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Many know me as the Ten Year Series book author for JC A-Level H2 Chemistry and O-Level Pure Chemistry. My 19+ years of coaching experience (since 1999) with more than 1500 students from 180+ JCs and Secondary Schools has allowed me to understand the true reasons why students are not able to perform well in Chemistry. Most importantly, my strength lies in using everyday analogies (even grandmothers can understand!) to simplify abstract concepts. Also, my teaching methodology has been designed to be fun, enjoyable and effective for my students. If you want to have an enjoyable time learning Chemistry and being motivated to excel in Chemistry, contact me today at 98287357
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