2009 GCE ‘O’ Levels Examinations will start in few days time. If you are a student based in Singapore, you must be excited it.
Hope you are revising well for Chemistry Exams. In any case that you would like more challenging exam-based questions to discuss – check out the following questions on Salts!
Question 1:
Which of the following salts cannot be prepared by reacting a metal with a dilute acid?A. copper(II) chloride
B. iron (II) chloride
C. magnesium sulfate
D. zinc sulfate
&
Question 2:
Which one of the following pairs consists of substances that produce a precipitate when their aqueous solutions are mixed?A. sodium nitrate, barium chloride
B. sodium nitrate, silver sulfate
C. sodium sulfate, barium chloride
D. sodium chloride, barium nitrate
&
Question 3:
The reaction represented by the ionic equation:Ba2+(aq) + SO42-(aq) –> BaSO4(s)
takes place readily when:
A. aqueous barium nitrate is added to aqueous sodium sulfate
B. molten barium sulfate is cooled until it solidifies
C. solid barium chloride is added to dilute sulfuric acid
D. solid barium sulfate is heated until it melts
All the best to your final revision for ‘O’ Level Chemistry Exams!
PS: I would love to hear from you on your preparation towards the exams. Hope this website helps you all this while.
Cheers,
Sean =)








Q1: A
Copper is non-reactive metal
Q2: C
Product = Sodium chloride (soluble) + barium sulfate (insoluble/ppt)
Q3: A
for those who are unsure, its the precipitation method for the preparation of insoluble salts
The question speaks for itself…
Reply
sean Reply:
October 31st, 2009 at 11:32 pm
Hi JM,
I love the way you explained it.
Your answers are spot on!
Keep up the good work,
Sean
Reply
Q1. A (copper does not react with dilute acids)
Q2. D (white ppt of barium chloride formed)
Q3. A ( the reaction shows dat barium is in (aq) state wheres options C and D shows barium is solid. in B, the BaSO4 is already a compound)
Reply
wats da ryt answer for Q2 ??? :S D or C n why?? :S
Reply
sean Reply:
October 31st, 2009 at 11:31 pm
Hi Samiha,
Answer for Question 2 is (C) as suggested by JM above.
The products of that mixing gives you Sodium chloride (soluble) + barium sulfate (insoluble/ppt).
Please note that your choice is incorrect since Barium Chloride is soluble in water.
Hope this helps.
Reply
Samiha Reply:
October 31st, 2009 at 11:45 pm
thanks
Reply