JEE Chemistry 2025 Question with Solution

Given: Two statements are given about oxalic acid vs $KMnO_4$ titration and FAS vs $KMnO_4$ titration in dilute $H_2SO_4$ medium.

Find: Which option correctly identifies the truth values of Statement I and Statement II.

The solution explicitly states that the correct option is A.

For Statement I, the solution says the oxalic acid vs $KMnO_4$ titration requires initial heating to about $60^\circ C$ because the reaction is slow at room temperature, whereas the FAS vs $KMnO_4$ titration proceeds fast enough at room temperature and does not require heating.

For Statement II, the solution says that in oxalic acid titration the initially formed $Mn^{2+}$ acts as an autocatalyst, so heating helps initiate the reaction. It also says heating in FAS titration may oxidize $Fe^{2+}$ to $Fe^{3+}$ by atmospheric oxygen and introduce error.

However, the same the solution concludes Both Statement I and Statement II are true, which corresponds to option B, while the solution marks A as the correct option. This is an internal discrepancy in the source.

Following the solution authority for answer label, the marked correct option is A.

Therefore, the correct option is A.

Given: The answer key says (A), and the solution says The Correct Option is A.

Find: Whether the detailed explanation supports the same option.

The explanatory paragraphs in the solution state:

1. Statement I is true.
2. Statement II is true.
3. Conclusion: Both Statement I and Statement II are true.

That conclusion matches option B, not option A.

So the source contains a contradiction between the marked option label and the written explanation. Since the page explicitly labels A as the correct option, the extracted answer is kept as A, and the inconsistency is noted here.