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Chapter Quiz
5 Easy
8 Medium
5 Hard
2 HOTS
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Assertion-Reason · Q1
Assertion (A): Decomposition reactions require an external source of energy to proceed.
Reason (R): Energy is needed to break the bonds of the reactant compound into simpler products.
✅ Answer: Both A and R are true and R is the correct explanation of A.
Assertion-Reason · Q2
Assertion (A): Rusting of iron is an example of a combination reaction.
Reason (R): Iron combines with oxygen and water to form hydrated iron oxide.
✅ Answer: Both A and R are true but R is NOT the correct explanation of A.
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Case Study 1
Rahul noticed that when he left a piece of iron nail outside in the rain for a few days, it turned reddish-brown. His teacher explained that this was a chemical change involving iron, oxygen, and water. The product formed was hydrated iron oxide. Rahul further observed that oiling the nail prevented this change.
Question 1
What type of chemical reaction is rusting of iron?
✅ Rusting is an oxidation reaction — iron loses electrons to oxygen in presence of water.
Question 2
Why does oiling the nail prevent rusting?
✅ Oil forms a barrier preventing contact between iron, oxygen, and water — all three are needed for rusting.
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MCQ · Q1
Which of the following best describes the law of conservation of mass in a chemical reaction?
Short Answer · Q1
What is the significance of Avogadro's number in chemistry?
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