Same chapter3 marksDifficulty: Medium
Distinguish between an exothermic and an endothermic reaction, with one example of each.
Chemical Changes and Reactions
3 marksDifficulty: Medium
What is a catalyst? Give one example with the reaction it catalyses.
Original Khojo Papers practice question — not from a past board paper.
Answer
A catalyst is a substance that alters the rate of a chemical reaction while itself remaining chemically unchanged in mass and composition at the end of it. Manganese dioxide catalyses the decomposition of hydrogen peroxide into water and oxygen.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Finely divided iron is the catalyst of the Haber process.
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Same chapter2 marksDifficulty: Easy
State three differences between a physical and a chemical change.
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