Grade 10 Physical Sciences · Chemical Change · Paper 2 (Chemistry)

Reactions in Aqueous Solution Grade 10

Real Reactions in Aqueous Solution past paper questions and answers from 2018 to 2025, with each memo split into the ticks examiners give. Try one, mark yourself, and see exactly which skill cost you marks.

past paper questions: 31 past paper questions
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Question 1.7 · November 2019 · Paper 2 · National (DBE) · 2 marks

Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E. Each question has only ONE correct answer.

1.7 The reaction between hydrogen chloride (HCl) and sodium hydroxide (NaOH) is an example of a/an ... reaction.(2)

A redox
B acid-base
C precipitation
D gas forming

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Reactions in Aqueous Solution skills

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More Reactions in Aqueous Solution Grade 10 questions and answers

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4. Question 6.2.3 · November 2019 · Paper 2 · National (DBE) · 3 marks
6.2 Consider the incomplete equation for the chemical reaction below.

$Zn(s) + H_{2} SO_{4} (aq) \to X + H_{2} (g)$

Answer the questions that follow.
6.2.3 Name the type of reaction illustrated above. Choose from ACID-BASE REACTION, PRECIPITATION REACTION or REDOX REACTION. Explain the answer.(3)
Show the memo (3 ticks)Memo
1. ✓
  RedoxRedox (reaction)
  1 mark · Describe ions and reactions in solution
2. ✓
  Charge of Zn in ZnThe charge of Zn changes from 0 in Zn
  1 mark · Assign oxidation numbers
3. ✓
  Charge of Zn in ZnSO₄to +2 in $ZnSO_{4}$ .
  1 mark · Assign oxidation numbers
5. Question 9.3 · November 2025 · Paper 2 · Provincial · 2 marks
A clean piece of aluminium metal strip is placed in a copper sulphate ( $CuSO_{4}$ ) solution. The reaction was observed again after 2 hours.

After 2 hours it was observed that the blue solution turned colourless and the shiny metallic aluminium turned brown.

The net ionic balanced equation for the reaction is given below:

$2 Al (s) + 3 Cu^{2 +} (aq) \to 3 Cu (s) + 2 Al^{3 +} (aq)$
9.3 Will the oxidation number of the sulphate ion INCREASE, DECREASE or REMAIN THE SAME during this reaction?

Give a reason for the answer.(2)
Show the memo (2 ticks)Memo
1. ✓
  AnswerREMAIN THE SAME
  1 mark · Describe ions and reactions in solution
2. ✓
  ReasonIt is the spectator ion.
  1 mark · Describe ions and reactions in solution
6. Question 4.5 · June 2024 · Paper 2 · Provincial · 3 marks
Chlorine gas can be prepared in the laboratory by allowing concentrated hydrochloric acid to react with manganese dioxide. Manganese (II) chloride and water also forms from the reaction.
4.5 Write an ionic equation for the formation of $KHSO_{4}$ .(3)
Show the memo (3 ticks)Memo
1. ✓
  Potassium ion $K^{+}$
  1 mark · Describe ions and reactions in solution
2. ✓
  Hydrogen sulphate ion $K^{+} + HSO_{4}^{-}$
  1 mark · Describe ions and reactions in solution
3. ✓
  Balancing $K^{+} + HSO_{4}^{-} \to KHSO_{4}$
  1 mark · Balance a chemical equation
7. Question 6.2 · November 2023 · Paper 2 · Provincial · 2 marks
In the reaction below, $3$ g of $Na_{2} CO_{3}$ were reacted with hydrochloric acid solution and an effervescence is observed.

$Na_{2} CO_{3} + HC ℓ \to NaC ℓ + CO_{2} + H_{2} O$
6.2 Write the NAME and FORMULAE of the substance that caused the effervescence.(2)
Show the memo (2 ticks)Memo
1. ✓
  NameCarbon(IV) oxide or carbon dioxide
  1 mark · Describe ions and reactions in solution
2. ✓
  Formula $CO_{2}$
  1 mark · Write names and formulae of compounds
8. Question 1.9 · November 2020 · Paper 2 · Provincial · 2 marks
1.9 An aqueous mixture in a test tube contains $Ag^{+}$ (aq), $K^{+}$ (aq) and $Pb^{+}$ (aq). How many different solids will form when NaCl(aq) is added to this mixture?(2)
1. A None
2. B 1
3. C 2
4. D 3
Show the memo (1 tick)Memo
1. ✓
  Correct optionChloride ions form precipitates with silver (AgCl) and with lead (lead chloride). Potassium chloride is soluble, so no solid forms with $K^{+}$ . Two solids.
  
  Answer: C
  2 marks · Write precipitation reactions and ion tests
9. Question 10.1.3 · November 2020 · Paper 2 · Provincial · 3 marks
10.1 The experimental set-up below is used in a Grade 10 class to demonstrate the electrical conductivity of a sodium chloride solution.

Answer the questions that follow.
10.1.3 What will happen to the brightness of the bulb in the set-up above if sodium chloride is replaced by calcium chloride?

Write down INCREASE, DECREASE or REMAIN THE SAME. Give a reason for your answer.(3)
Show the memo (3 ticks)Memo
1. ✓
  PredictionIncreases
  1 mark · Describe ions and reactions in solution
2. ✓
  More ionsCalcium chloride consists of three ions where sodium chloride consists of two ions; therefore the concentration of ions in the solution increases,
  1 mark · Describe ions and reactions in solution
3. ✓
  Higher conductivitywhich will result in an increase in conductivity.
  1 mark · Describe ions and reactions in solution
10. Question 8.1.3 · November 2024 · Paper 2 · Provincial · 1 mark
8.1 A solution of nickel (II) nitrate is placed in a zinc container. It was observed, after some time, that a chemical reaction has taken place. The net ionic equation is:

$Zn(s) + Ni^{2 +} (aq) ⇌ Zn^{2 +} (aq) + Ni(s)$
8.1.3 Give a reason why the nitrate ion ( $NO_{3}^{-}$ ) is not written in the net ionic equation above.(1)
Show the memo (1 tick)Memo
1. ✓
  Spectator ionNitrate ion ( $NO_{3}^{-}$ ) is a spectator ion / undergoes no changes in its oxidation state.
  1 mark · Describe ions and reactions in solution

Reactions in Aqueous Solution Grade 10 videos

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Dissolving and Hydration Grade 10Kevinmathscience

Precipitates Grade 10 | Part 1Kevinmathscience

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