Given below are two statements,one is labelled as Assertion `A` and other is labelled as Reason R
Assertion A: The alkali metals and their salts impart characteristic colour to reducing flame.
Reason R : Alkalia metals can be detected using flame tests.
In the light of above statements, choose the most appropriate answer from the options given below

Options

A. `A` is not correct but `R` is not correct
B. Both `A` and `R` are correct but `R` is NOT the correct explanation of `A`
C. Both `A` and `R` are correct but `R` is the correct explanation of `A`
D. `A` is correct but `R` is not correct

Answer

To solve the assertion-reason question, we need to analyze both statements carefully.

### Step 1: Analyze the Assertion (A)
**Assertion A:** "The alkali metals and their salts impart characteristic colour to reducing flame."

- Alkali metals do impart characteristic colors when subjected to flame tests. However, it is important to note that these colors are observed in an oxidizing flame, not a reducing flame. Common examples include:
- Lithium: crimson red
- Sodium: bright yellow
- Potassium: lilac
- Rubidium: red-violet
- Cesium: blue

**Conclusion for Assertion A:** The assertion is incorrect because it mentions "reducing flame" instead of "oxidizing flame."

### Step 2: Analyze the Reason (R)
**Reason R:** "Alkali metals can be detected using flame tests."

- This statement is true. Flame tests are a common qualitative analysis method used to identify the presence of alkali metals based on the characteristic colors they emit when heated in a flame.

**Conclusion for Reason R:** The reason is correct.

### Step 3: Determine the Relationship between Assertion and Reason
- The assertion is incorrect, while the reason is correct. Therefore, the reason does not explain the assertion.

### Final Answer
Based on the analysis:
- Assertion A is incorrect.
- Reason R is correct.
- The correct answer is: **Option 1** (Assertion is false, Reason is true).

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