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Important Questions

Chemical Changes and Reactions

ICSE · Class 9 · Chemistry

Most important questions from Chemical Changes and Reactions for ICSE Class 9 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.

43 questions36 flashcards5 concepts

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An infographic illustrating various conditions required for chemical reactions to occur, such as close contact, solution, heat, light, electricity, pressure, and catalysts, with a simple example for e
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43 Questions·
multiple choicemultiple correcttrue falsetext answermatching

Sample Questions

1multiple correct

Which conditions are necessary for chemical reactions to occur?

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Mixing the substances in close contact, Supplying heat, Supplying light, Passing electricity

A chemical change can occur when reactant particles collide, and collisions happen when substances are brought into close contact or when energy is supplied. The chapter lists mixing, heat, light, electricity, pressure, and catalysts as conditions that can bring about reactions. Keeping reactants separated does not help collisions occur, so it is not a necessary condition.

2true false

Photosynthesis is an example of an endothermic reaction.

Show answer

True

Photosynthesis is an endothermic reaction because it requires energy input from sunlight to convert carbon dioxide and water into glucose and oxygen. Energy is absorbed during this process.

3text answer

Which gas is evolved when zinc reacts with dilute sulfuric acid?

4matching

Match the following reactions with their types:

+39 more questions available

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Frequently Asked Questions

What are the important topics in Chemical Changes and Reactions for ICSE Class 9 Chemistry?
Key topics in Chemical Changes and Reactions include Chemical Reactions Overview, Thermal Decomposition of Metal Nitrates — Correct Product Prediction, Types of Chemical Reactions — Master Mind Map. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Changes and Reactions — ICSE Class 9 Chemistry?
Understand the core concepts first, then work through the 43 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Chemical Changes and Reactions?
There are 43 practice questions available for Chemical Changes and Reactions. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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