Given below are two statements : In light of the above statements, choose the most appropriate answer from the options given below.
- Statement I is incorrect but Statement II is correct
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
Answer
(1) Statement I is incorrect but Statement II is correct
Solution
1. In the reaction of NaCl with concentrated H2SO4 and MnO2:
4NaCl + MnO2 + 4H2SO4 MnSO4 + 2NaHSO4 + 2H2O + Cl2
The oxidation state of Mn decreases from +4 in MnO2 to +2 in MnSO4, which is a reduction of Mn. Therefore, Statement I is incorrect.
2. Similarly, with NaI, MnO2 acts as an oxidising agent and is reduced from Mn(IV) to Mn(II), oxidising I- to I2. Therefore, Statement II is correct.
Answer: (1)