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IGCSE Chemistry Mock – Set 1 Paper 3-Updated 2026

IGCSE Chemistry Mock – Set 1 Paper 3 – 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 

Fig. 1.1 shows part of the Periodic Table.

(a) Answer the following questions using only the elements in Fig. 1.1. Each symbol of the element may be used once, more than once or not at all. Give the symbol of the element that:

(i) is in brass

(ii) produces an orange-red colour in a flame test

(iii) is a reactant in a fuel cell

(iv) has an atom with only three occupied electron shells

(v) forms an ion that gives a red-brown precipitate on addition of aqueous ammonia

(vi) forms an ion with a charge of 1-.

(b) Explain why Li, K and Rb have similar chemical properties.

▶️ Answer/Explanation
Solution

(a)

(i) Zn – Brass is an alloy of copper and zinc.

(ii) Ca – Calcium produces an orange-red flame color in flame tests.

(iii) H – Hydrogen is a reactant in fuel cells, combining with oxygen to produce electricity.

(iv) Al – Aluminum has electrons in three shells (2,8,3).

(v) Fe – Iron(III) ions form a red-brown precipitate with aqueous ammonia.

(vi) I – Iodine forms I⁻ ions with a 1- charge.

(b) Li, K and Rb have similar chemical properties because they are all in Group I (alkali metals) of the periodic table. This means they have the same number of electrons in their outer shell (1 electron each). Elements in the same group have similar chemical properties because chemical reactions primarily involve the outer shell electrons, and when these are the same, the elements behave similarly in chemical reactions.

Detailed Explanation:

1. For part (a), we need to identify elements based on their specific properties:

  • Brass contains zinc (Zn) along with copper
  • Calcium (Ca) gives characteristic orange-red color in flame tests
  • Hydrogen (H) is used in fuel cells
  • Aluminum (Al) has three electron shells occupied (n=1,2,3)
  • Iron (Fe) forms Fe³⁺ which gives red-brown precipitate with NH₃
  • Iodine (I) forms I⁻ ions commonly

2. For part (b), the key points are:

  • Group I elements have identical outer electron configuration (ns¹)
  • This similar electron configuration leads to similar chemical behavior
  • All readily lose one electron to form +1 ions
  • All react vigorously with water to form alkaline solutions

The periodic trend explains why elements in the same group behave similarly despite having different numbers of electron shells.

IGCSE Chemistry Mock Paper 3 - Full Access
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