WINNERS Education Group
Name ___________________________
Date _________________
Chemistry: Acids, Bases & Preparation of Salts Pre – Evaluation Test
/25
 25 minutes
Answer all the questions.
You are reminded of the need for clear presentation in your answers.
Question 1:
What does a solution of hydrogen chloride in methylbenzene (an organic solvent) contain?
(1 mark)
A Methylbenzene ions, hydrogen ions and chloride ions
B Methylbenzene ions, hydrogen chloride molecules
C Methylbenzene molecules, hydrogen chloride molecules
D Methylbenzene molecules, hydrogen molecules and chlorine molecules
Question 2:
Which one of the following is the best pair of reagents to use for preparing copper (II)
sulfate crystals?
(1 mark)
A Copper metal and dilute sulfuric acid
B Copper (II) carbonate and aqueous ammonium sulfate
C Copper (II) chloride and dilute sulfuric acid
D Copper (II) oxide and dilute sulfuric acid
Question 3:
Which one of the following reactions could be represented by the ionic equation below in
which M is the symbol for a metallic element?
(1 mark)
M(s) + 2H+(aq)  M2+(aq) + H2(g)
A Iron + dilute hydrochloric acid
B Lead + dilute sulfuric acid
C Copper + dilute nitric acid
D Iron + steam
Question 4:
Which one of the following burns in air to give a compound which in water gives a
solution of pH 2?
(1 mark)
A Aluminium
B Hydrogen
C Sodium
D Sulfur
[Turn Over]
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Question 5:
The table below gives information about three indicators.
Indicator
Methyl orange
Bromothymol blue
Phenolphthalein
Colour change
Low pH – high pH
Red yellow
Yellow  blue
Colourless  pink
(1 mark)
pH at which color
change takes place
4
6.5
9
In equal volumes of these three indicators were mixed, which color would be observed at
pH 5?
A Green
B Orange
C Red
D Yellow
Question 6:
Which one of the following oxides reacts with aqueous sodium hydroxide to give a salt?
(1 mark)
A Copper (II) oxide
B Iron (II) oxide
C Magnesium oxide
D Zinc oxide
Question 7:
Which of the following elements can form both a neutral and an acidic oxide?
(1 mark)
A Aluminium
B Phosphorus
C Zinc
D Carbon
Question 8:
Which of the following salts can be crystallized from aqueous solution?
(1 mark)
A Barium sulfate
B Calcium carbonate
C Potassium nitrate
D Silver chloride
[Turn Over]
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Question 9:
Barium sulfate is insoluble in water. Which method could be used to prepare a pure
sample of the salt from dilute Sulfuric acid?
(1 mark)
A Add an excess of barium carbonate, filter, wash and dry the residue
B Add an excess of barium hydroxide, filter, crystallize the filtrate
C Add aqueous barium chloride, filter, crystallize the filtrate
D Add aqueous barium chloride, filter, wash and dry the residue
Question 10:
The table gives information about the solubilities of the hydroxides, carbonates, and
sulfates of calcium, sodium and zinc.
(1 mark)
Hydroxide
Slightly soluble
Soluble
Insoluble
Calcium
Sodium
zinc
Carbonate
Insoluble
Soluble
Insoluble
Sulfate
Slightly soluble
Soluble
Soluble
Which is the best way of making zinc carbonate?
A Shake solid zinc hydroxide with aqueous sodium hydroxide and pass in carbon dioxide
B Shake solid zinc sulfate and solid calcium carbonate with water
C Shake solid zinc sulfate with water and add aqueous sodium carbonate
D Shake aqueous zinc sulfate with solid calcium hydroxide and pass in carbon dioxide
Question 11:
Five students each dissolved an indigestion tablet in 100 cm3 of water. They then each
titrated 25.0 cm3 of their solutions with dilute hydrochloric acid, using the same indicator.
The results are shown in the table.
Student
number
Titration
value /
cm3
(1 mark)
1
2
3
4
5
20.4
20.5
20.4
20.6
22.0
Which statement could explain the result obtained by student number 5?
A The burette was washed out with hydrochloric acid
B The pipette was washed out with the tablet solution
C The student measured to the top of the meniscus in the pipette
D The titration flask was washed out with the tablet solution
[Turn Over]
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Question 12:
Which pair of gases explodes when ignited to form a product which, when mixed with
water, produces a solution of pH 7?
(1 mark)
A Hydrogen and chlorine
B Hydrogen and nitrogen
C Hydrogen and oxygen
D Oxygen and carbon monoxide
Question 13:
Which oxide reacts with acid to form a salt, but does not reach with an alkali? (1 mark)
A Aluminium oxide
B Carbon dioxide
C Magnesium oxide
D Zinc oxide
Question 14:
In an accident at a factory, some Nitric Acid was spilt.
(1 mark)
Which substance, when added in excess, would neutralize the acid without leaving an
alkaline solution?
A Aqueous ammonia
B Aqueous sodium hydroxide
C Calcium carbonate
D Water
Question 15:
All of the following will have chemical reactions except,
(1 mark)
A Calcium oxide solid + hydrochloric acid
B Calcium hydroxide solid + hydrochloric acid
C Calcium hydroxide solution + hydrochloric acid
D Calcium carbonate solid + hydrochloric acid
Question 16:
Which one of the following compounds in a 1 mol/dm3 solution has lowest pH value?
(1 mark)
A Ethanoic acid
B Hydrogen chloride
C Sodium chloride
D Sodium hydroxide
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Question 17:
Name the products obtained when calcium hydroxide is
a) dissolved in dilute HCl
b) heated in ammonium chloride
(1 mark)
(1 mark)
Question 18:
Solution A contains 25cm3 of 0.1 mol/dm3 hydrochloric acid. Solution B contains 50cm3
of 1 mol/dm3 ethanoic acid. Which solution has a higher pH value? Explain your answer.
[Note: mol/dm3 is a unit of concentration; the higher the value, the more concentrated the
solution is]
(2 marks)
Question 19:
Joyce, a Secondary 4 chemistry student was given a sample of hydrogen chloride gas.
(a) She was told to test for the acidity of the gas and used a dry blue litmus paper to test.
Describe the colour change she would observe.
(1 mark)
(b) The sample of hydrogen chloride gas was dissolved in water. Name the ions that are
present after the hydrogen chloride was dissolved in water.
(1 mark)
(c) A piece of zinc wire which had been freshly sandpapered was added to the solution of
hydrogen chloride. Describe what you would see.
(1 mark)
(d) Write a balanced chemical equation, with state symbols for the reaction.
(1 mark)
(e) Hence, determine the ionic equation
(1 mark)
End of Paper
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Answer key
MCQ
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
C
D
A
D
D
D
D
C
D
C
Question No.
Answer
Q17 (a)
(b)
Q18
D
C
C
C
B
B
Calcium chloride and Water
Calcium chloride, Water and Ammonia Gas
Solution B. Ethanoic Acid is a weak acid and thus has higher pH value than
hydrochloric acid which is a strong acid. Concentration does NOT affect the
pH of acid solution.
Q19 (a)
Remains Blue
(b)
Hydrogen ions
(c)
Effervescence (or Bubbling)
(d)
Zn(s) + 2HCl(aq)  ZnCl2(aq) + H2(g)
(e)
Zn(s) + 2H+(aq)  Zn2+(aq) + H2(g)
Performance Indicator
20 – 25 marks:
Well Done! You show a high level of understanding in the topics tested. Keep up the
good work! You are highly recommended to expose yourself to more variety of questions.
19 marks and less:
You can definitely do better! You need to relearn some of the fundamental essential
concepts for the topics tested. You might be lacking on tools or strategies to answer the
questions. You are highly recommended to attend our Mastery Workshop on Acids,
Bases & Preparation of Salts to strengthen your understanding. Click here to register:
http://www.WinnersEducation.com
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