Chemical Reactions — Practice Quiz
ICSE · Class 8 · Chemistry
Try a 4-question quiz on Chemical Reactions for ICSE Class 8 Chemistry: tap an answer to check it and see why. 63 questions in the full chapter test.
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Quick Quiz: Chemical Reactions
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Which pair correctly names the substances that take part in a chemical reaction?
What are the new substances formed in a chemical reaction called?
Which of these is a positive catalyst?
Which substance is used as a promoter in ammonia formation?
Sample Questions
Which substance acts as a negative catalyst for the decomposition of hydrogen peroxide?
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Phosphoric acid
Phosphoric acid decreases the rate of decomposition of hydrogen peroxide, so it is a negative catalyst.
Which is an example of a characteristic colour change in a reaction?
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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.
What is effervescence?
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Formation of gas bubbles in a liquid during a chemical reaction
Effervescence means gas bubbles are formed in a liquid during a reaction.
Which equation represents the general form of a combination reaction?
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A + B → AB
In a combination reaction, two or more substances combine to form a single product.
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