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IGCSE Chemistry Mock – Set 3 Paper 4-Updated 2026

IGCSE Chemistry Mock – Set 3 Paper 4 – 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.

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

CIE iGCSE Chemistry Mock test – All Sets

Question 

The formulae of the molecules A to I are shown in Table 1.1.

Table 1.1

Answer the following questions about the molecules, A to I. Each letter may be used once, more than once or not at all.

State which of the molecules A to I:

(a) is an element with a triple bond 

(b) is a product of photosynthesis 

(c) is used as a fuel 

(d) turns limewater milky 

(e) undergoes a substitution reaction with alkanes 

(f) is a colourless liquid at r.t.p. 

(g) is unsaturated 

(h) is 21% of clean, dry air 

(i) is a reactant in the Haber process. 

▶️ Answer/Explanation
Solution

(a) G (\( N_2 \))

Nitrogen (\( N_2 \)) is an element with a triple bond between the two nitrogen atoms.

(b) D (\( CO_2 \))

Carbon dioxide is a product of photosynthesis, along with oxygen.

(c) B (\( C_2H_5OH \))

Ethanol (\( C_2H_5OH \)) is commonly used as a fuel, especially in biofuel applications.

(d) D (\( CO_2 \))

Carbon dioxide turns limewater milky due to the formation of calcium carbonate precipitate.

(e) E (\( Cl_2 \))

Chlorine undergoes substitution reactions with alkanes, replacing hydrogen atoms.

(f) B (\( C_2H_5OH \))

Ethanol is a colourless liquid at room temperature and pressure (r.t.p.).

(g) A (\( C_2H_4 \))

Ethene (\( C_2H_4 \)) is unsaturated as it contains a carbon-carbon double bond.

(h) H (\( O_2 \))

Oxygen makes up approximately 21% of clean, dry air.

(i) G (\( N_2 \))

Nitrogen is one of the reactants in the Haber process for ammonia production.

IGCSE Chemistry Mock Paper 4 - Full Access
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