Chemical Reactions — Important Questions
ICSE · Class 8 · Chemistry
63 important questions from Chemical Reactions for ICSE Class 8 Chemistry, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Chemical Reactions
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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