Q1. [1] § 3.4 OCCURRENCE OF METALS
Assertion (A) : Different metals have different reactivities with water and dilute acids.
Reason (R) : Extraction of a metal from its ore depends on its position in the reactivity series.
- (A) Both (A) and (R) are true and (R) is the correct explanation of (A).
- (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- (C) (A) is true, but (R) is false.
- (D) (A) is false, but (R) is true.
Previously asked in CBSE board exam
2024 31/2/1 Q17
Generated by claude-sonnet-4-6 · 2026-06-15 06:49 · grounding rag
Model Answer
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
Both statements are independently correct facts about the reactivity series, but the position of a metal in the reactivity series explains extraction methods, not the difference in reactivity with water and acids.
Explanation
- (A) is true: the reactivity series itself shows metals differ in reactivity with water and dilute acids.
- (R) is true: metals high in the series need electrolysis, middle ones need reduction, low ones are found free.
- However, (R) talks about extraction, which is a separate application of the reactivity series and does not explain why metals react differently with water/acids. Hence (B) is correct.
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