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IGCSE Chemistry Mock – Set 1 Paper 1-Updated 2026

IGCSE Chemistry Mock – Set 1 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 

Substance L takes the shape of the container that holds it.

What could be the state of matter of substance L?

A) liquid or gas
B) gas or solid
C) solid or liquid
D) solid only

▶️ Answer/Explanation
Solution

Ans: A

Both liquids and gases take the shape of their container. Liquids take the shape but have a fixed volume, while gases take both the shape and volume of their container. Solids maintain their own shape regardless of the container. Therefore, substance L could be either a liquid or a gas.

Question 

A sample of fertiliser is tested by warming it with aqueous sodium hydroxide.

A colourless gas is produced which turns damp red litmus paper blue.

Which element, essential for plant growth, must be present?

A) nitrogen
B) phosphorus
C) potassium
D) sulfur

▶️ Answer/Explanation
Solution

Ans: A

1. The test described is the standard test for ammonium ions (NH4+), which are common in nitrogen-containing fertilizers.

2. When warmed with NaOH, ammonium compounds release ammonia gas (NH3): \[ \text{NH}_4^+ + \text{OH}^- \rightarrow \text{NH}_3 + \text{H}_2\text{O} \]

3. Ammonia gas is colorless and turns damp red litmus paper blue because it’s alkaline.

4. While phosphorus, potassium, and sulfur are also essential for plant growth, they don’t produce ammonia gas in this test.

5. Therefore, the element that must be present is nitrogen (option A).

Question 

Ethanoic acid reacts with aqueous sodium carbonate.

Which gas is given off in this reaction?

A) hydrogen
B) carbon dioxide
C) carbon monoxide
D) oxygen

▶️ Answer/Explanation
Solution

Ans: B

When ethanoic acid (a weak acid) reacts with sodium carbonate (a base), a neutralization reaction occurs producing sodium ethanoate, water, and carbon dioxide gas. The reaction can be represented as: \( 2CH_3COOH + Na_2CO_3 \rightarrow 2CH_3COONa + H_2O + CO_2 \). This is a standard test for carboxylic acids – they produce effervescence (bubbles) of carbon dioxide when reacted with carbonates. The other gases listed are not products of this reaction.

IGCSE Chemistry Mock Paper 1 - Full Access
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