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Important Questions

Chemical Reactions

ICSE · Class 8 · Chemistry

Most important questions from Chemical Reactions for ICSE Class 8 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.

63 questions40 flashcards5 concepts

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63 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
1 marks

Which substance acts as a negative catalyst for the decomposition of hydrogen peroxide?

Show answer

Phosphoric acid

Phosphoric acid decreases the rate of decomposition of hydrogen peroxide, so it is a negative catalyst.

2multiple choice
1 marks

Which is an example of a characteristic colour change in a reaction?

Show answer

Blue copper sulphate solution turning light green when iron is added

When iron displaces copper from copper sulphate solution, the colour changes from blue to light green.

3multiple choice
1 marks

What is effervescence?

Show answer

Formation of gas bubbles in a liquid during a chemical reaction

Effervescence means gas bubbles are formed in a liquid during a reaction.

4multiple choice
1 marks

Which equation represents the general form of a combination reaction?

Show answer

A + B → AB

In a combination reaction, two or more substances combine to form a single product.

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Frequently Asked Questions

What are the important topics in Chemical Reactions for ICSE Class 8 Chemistry?
Chemical Reactions covers several key topics that are frequently asked in ICSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Chemical Reactions — ICSE Class 8 Chemistry?
Understand the core concepts first, then work through the 63 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 Reactions?
There are 63 practice questions available for Chemical 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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