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IGCSE Chemistry Mock – Set 2 Paper 1-Updated 2026

IGCSE Chemistry Mock – Set 2 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 conditions cause gas particles to move the fastest and the furthest apart?

 temperaturepressure
Ahighhigh
Blowhigh
Chighlow
Dlowlow
▶️ Answer/Explanation
Solution

Ans: C

Gas particles move fastest at high temperatures because temperature is directly related to the kinetic energy of particles. At higher temperatures, particles have more energy and move faster.

Particles move furthest apart at low pressures because there’s more space between them when the pressure is reduced. High pressure forces particles closer together.

Therefore, the combination that causes gas particles to move fastest and furthest apart is high temperature and low pressure.

Question 

What is the nucleon number of an atom?

A) the number of neutrons
B) the number of protons
C) the total number of protons and neutrons
D) the total number of protons and electrons

▶️ Answer/Explanation
Solution

Ans: C

The nucleon number (also called mass number) of an atom is defined as the sum of protons and neutrons in the nucleus.

Let’s analyze each option:

A) Incorrect – This describes only the neutron number.

B) Incorrect – This describes the atomic number (proton number).

C) Correct – This is the exact definition of nucleon number.

D) Incorrect – This would include electrons, which are not part of the nucleus (hence not nucleons).

Question 

Which row identifies a basic oxide and describes an alkali?

 basic oxidedescription of an alkali
Asodium oxideinsoluble base
Bsodium oxidesoluble base
Csulfur dioxideinsoluble base
Dsulfur dioxidesoluble base
▶️ Answer/Explanation
Solution

Ans: B

Sodium oxide (Na2O) is a basic oxide because it reacts with acids to form salts and water. Basic oxides are typically formed by metals.

An alkali is specifically defined as a soluble base. Therefore, the correct description is “soluble base”.

Sulfur dioxide (SO2) is actually an acidic oxide, not basic, as it forms sulfurous acid when dissolved in water. This eliminates options C and D.

Between A and B, the key difference is the description of alkali. Since alkalis are soluble bases, option B is correct.

IGCSE Chemistry Mock Paper 1 - Full Access
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