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(a). IF both (A) and (R) are correct and...

(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A).
(b). If both (A) and (R) are correct but (R) is not the correct explanation of (A).
(c). If (A) is correct, but (R) is incorrect.
(d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect.
Q. Assertion: 5.0 " mol of "ferrous oxalate are completely oxidised by 2.5 moles of acidic solution of `K_(2)Cr_(2)O_(7)`.
Reason(R): n-factor of ferrous oxalate against dichromate is 3.

Text Solution

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The correct Answer is:
To solve the problem, we need to analyze the assertion and the reason provided, and then determine their correctness based on stoichiometric principles. ### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: - The assertion states: "5.0 moles of ferrous oxalate are completely oxidized by 2.5 moles of acidic solution of K2Cr2O7." - We need to check if this statement is true based on stoichiometry. 2. **Understanding the Reason (R)**: - The reason states: "n-factor of ferrous oxalate against dichromate is 3." - The n-factor is critical in determining how many moles of a substance react with another in redox reactions. 3. **Calculating the n-factor for K2Cr2O7**: - In the reaction involving K2Cr2O7, chromium (Cr) is reduced from +6 to +3. - The change in oxidation state for 2 chromium atoms (from +6 to +3) results in a total of 6 electrons being involved. - Therefore, the n-factor for K2Cr2O7 is 6. 4. **Calculating the n-factor for Ferrous Oxalate (FeC2O4)**: - Ferrous oxalate (FeC2O4) has two components: Fe^2+ is oxidized to Fe^3+ (which requires 1 electron), and C2O4^2- is oxidized to CO2 (which requires 2 electrons). - Thus, the total n-factor for ferrous oxalate is 1 (from Fe) + 2 (from C2O4) = 3. 5. **Stoichiometric Relationship**: - According to the stoichiometry of the reaction: - The number of equivalents of K2Cr2O7 should equal the number of equivalents of ferrous oxalate. - For K2Cr2O7: - Moles = 2.5, n-factor = 6 → equivalents = 2.5 * 6 = 15 equivalents. - For ferrous oxalate: - Moles = 5, n-factor = 3 → equivalents = 5 * 3 = 15 equivalents. - Since both sides are equal (15 = 15), the assertion is correct. 6. **Conclusion**: - Both the assertion (A) and the reason (R) are correct. - Additionally, the reason (R) correctly explains the assertion (A) since the n-factor of ferrous oxalate is indeed 3, which supports the stoichiometric relationship stated in the assertion. ### Final Answer: The correct option is (a): If both (A) and (R) are correct and (R) is the correct explanation of (A).
To solve the problem, we need to analyze the assertion and the reason provided, and then determine their correctness based on stoichiometric principles. ### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: - The assertion states: "5.0 moles of ferrous oxalate are completely oxidized by 2.5 moles of acidic solution of K2Cr2O7." - We need to check if this statement is true based on stoichiometry. ...
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