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IGCSE Chemistry Mock – Set 3 Paper 1-Updated 2026

IGCSE Chemistry Mock – Set 3 Paper 1 – Updated 2026

Preparing for your CIE IGCSE Chemistry exam can be daunting, but with the right approach, you can achieve your goals with CIE iGCSE Chemistry Mock test.

Ace your CIE iGCSE Chemistry exam! Find exam-style questions, detailed notes, and helpful resources to boost your understanding.

iGCSE Practice Questions, Past Papers, Flashcards and notes available for iGCSE Students at IITian Academy.

CIE iGCSE Chemistry Mock test – All Sets

Question 

Which indicators turn blue when added to aqueous ammonia?

  1. litmus
  2. thymolphthalein
  3. universal indicator

A) 1, 2 and 3
B) 1 and 2 only
C) 1 and 3 only
D) 2 and 3 only

▶️ Answer/Explanation
Solution

Ans: A

Aqueous ammonia is a weak alkali (pH about 11). Let’s examine each indicator:

1. Litmus turns blue in alkaline solutions (pH > 7).

2. Thymolphthalein is colorless in acidic and neutral solutions but turns blue in alkaline solutions (pH > 9.3).

3. Universal indicator turns blue/purple in alkaline solutions, depending on the pH.

Since all three indicators turn blue (or bluish colors) in alkaline solutions like aqueous ammonia, the correct answer is A (1, 2, and 3).

Question 

J, L and M are elements in the Periodic Table.

  • J has the highest density.
  • L has the highest reactivity with water.
  • M has the highest atomic number.

Which row identifies the elements J, L and M?

 JLM
Acopperlithiumbromine
Blithiumcopperbromine
Cbrominecopperlithium
Dcopperbrominelithium
▶️ Answer/Explanation
Solution

Ans: A

Let’s analyze each characteristic:

1. Highest density (J): Copper (8.96 g/cm³) has higher density than lithium (0.534 g/cm³) and bromine (3.12 g/cm³).

2. Highest reactivity with water (L): Lithium (Group I metal) is much more reactive with water than copper (which doesn’t react with water) or bromine (a halogen).

3. Highest atomic number (M): Bromine (35) has higher atomic number than copper (29) and lithium (3).

Therefore, the correct identification is:

J = copper, L = lithium, M = bromine → Option A.

Question 

Iron is extracted from its ore in the blast furnace.

Which statement about one of the reactions in the blast furnace is correct?

A) Carbon monoxide is reduced to carbon dioxide.
B) Iron(III) oxide is reduced by carbon dioxide.
C) Slag is produced when calcium carbonate reacts with carbon dioxide.
D) The reaction that heats the blast furnace produces carbon dioxide.

▶️ Answer/Explanation
Solution

Ans: D

In the blast furnace:

A) Incorrect – Carbon monoxide is oxidized to carbon dioxide when it reduces iron(III) oxide, not reduced.

B) Incorrect – Iron(III) oxide is reduced by carbon monoxide, not carbon dioxide.

C) Incorrect – Slag is produced when calcium oxide (from the decomposition of calcium carbonate) reacts with silicon dioxide (impurity).

D) Correct – The exothermic reaction of coke (carbon) with oxygen to produce carbon dioxide provides the heat needed for the process.

The key reactions are:
\( \text{C} + \text{O}_2 \rightarrow \text{CO}_2 \) (heat-producing reaction)
\( \text{CO}_2 + \text{C} \rightarrow 2\text{CO} \)
\( \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2 \) (reduction of iron ore)

IGCSE Chemistry Mock Paper 1 - Full Access
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