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NABTEB Chemistry Past Questions and Solutions.

Published on Aug 22, 2025 • Education

Introduction

Hello everyone, welcome to today’s class! My name is Aden, and we’ll be looking at some NABTEB Chemistry past questions with detailed solutions. These step-by-step explanations will help you prepare effectively for NABTEB, WAEC, and JAMB Chemistry exams.

Let’s get started with the questions and answers.

Question 1 – Separation of Miscible Liquids

The first question says:
Two miscible liquids, A with boiling point 35°C and B with boiling point 38°C, are mixed together in a container. What separation technique should be employed?

Options

A. Distillation
B. Evaporation
C. Chromatography
D. Filtration

Correct Answer: A. Distillation

Explanation

• Distillation is the process used to separate miscible liquids with close but different boiling points.
• Since liquid A has a boiling point of 35°C and liquid B has 38°C, simple distillation can effectively separate them.
• Evaporation is unsuitable because it cannot separate two liquids.
• Filtration only separates insoluble solids from liquids.
• Chromatography is mainly for mixtures of dyes, pigments, or gases.

Real-Life Application

Distillation is widely used in:

• Petroleum refining (separating crude oil into fractions).
• Alcohol production (separating ethanol from fermentation mixtures).
• Water purification (removing impurities from water).

Exam Tip

When you see questions about separating miscible liquids with close boiling points, always think of distillation. If the boiling points are very close, then fractional distillation is used.

Watch the full tutorial here: https://www.youtube.com/watch?v=rJ4GAr5fImQ&t=3s

Conclusion

The correct technique to separate two miscible liquids with boiling points of 35°C and 38°C is distillation. Understanding separation techniques is vital in Chemistry practicals and theory exams for NABTEB, WAEC, and JAMB.

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