Question

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.

Answer 1

The Correct Option is A

Step 1: Understanding the assertion (A):
Assertion (A) states that different metals have different reactivities with water and dilute acids. This is true. Metals have different reactivities based on their positions in the reactivity series. For example, potassium and sodium, which are highly reactive metals, react vigorously with water, whereas metals like gold and platinum, which are less reactive, do not react significantly with water or dilute acids.

Step 2: Understanding the reason (R):
Reason (R) suggests that the extraction of a metal from its ore depends on its position in the reactivity series. This is also true. The position of a metal in the reactivity series determines how easily it can be extracted from its ore. More reactive metals, which are higher in the series, are harder to extract and require more complex processes such as electrolysis or reduction. Less reactive metals, found lower in the series, can be extracted by simpler methods.

Step 3: Analyzing the relationship between assertion and reason:
Reason (R) directly explains Assertion (A). The reactivity of a metal with water and dilute acids is directly related to its position in the reactivity series. Highly reactive metals, which are higher in the series, react more vigorously with water and acids, while metals lower in the series are less reactive. Additionally, the method of extraction from the ore is influenced by the metal’s reactivity, as more reactive metals are more difficult to extract.

Step 4: Conclusion:
The correct answer is: Both (A) and (R) are true and (R) is the correct explanation of (A). Reason (R) provides a valid explanation for why different metals have varying reactivities with water and dilute acids based on their position in the reactivity series.