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IJMB Chemistry Past Questions.

Published on Jul 30, 2025 • Education

Introduction

Good day everyone!
In this tutorial, we will review IJMB Chemistry 2016 past questions focusing on mole calculations, molecular ions, and fundamental chemical constants. These are common areas tested in IJMB exams and are crucial for students preparing for university direct entry programs.

Let’s get started with the questions and answers.

Question 1: Mole Calculation for Copper Formation

Question:
Calculate the number of moles of copper formed when 20.50 g of copper(II) oxide completely reacts with hydrogen gas.

Final Answer

The number of moles of copper formed is 0.256 moles.

Question 2: Define Molecular Ion

Answer:
Molecular ions, also called radicals or polyatomic ions, are groups of atoms bonded together that carry an overall charge.

Examples:

• NH₄⁺ (Ammonium ion)
• CO₃²⁻ (Carbonate ion)
• SO₄²⁻ (Sulfate ion)

These ions behave as single units in chemical reactions.

Question 3: Number of Atoms in Three Moles of Cobalt

Question:
How many atoms are there in three moles of cobalt?

Watch more educational videos and past questions: https://youtube.com/@allcbts

Conclusion

Mastering mole concepts, molecular ions, and Avogadro’s constant is vital for scoring high in IJMB Chemistry exams. By understanding the principles behind these questions, students can tackle similar problems confidently during exams.

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Keywords

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