Given below are two statements: Statement-I : Heating NaCl with concentrated H_2SO_4 and MnO_2 results in oxidation of Mn. Statement-II : Heating NaI with concentrated H_2SO_4 and MnO_2 results in reduction of Mn. In light of the above statements, choose the most appropriate answer from the options given below:
A. Statement-I is incorrect but Statement-II is correct.
The reaction of NaCl with concentrated H _2 SO _4 and MnO _2 is given by: 2 NaCl + MnO _2 + 2 H _2 SO _4 Na _2 SO _4 + MnSO _4 + 2 H _2 O + Cl _2 In this reaction, the oxidation state of Mn changes from +4 in MnO _2 to +2 in MnSO _4. Since the oxidation state decreases, Mn undergoes reduction, not oxidation. Thus, Statement-I is incorrect. The reaction of NaI with concentrated H _2 SO _4 and MnO _2 is given by: 2 NaI + MnO _2 + 2 H _2 SO _4 Na _2 SO _4 + MnSO _4 + 2 H _2 O + I _2 Here, the oxidation state of Mn also changes from +4 to +2, which means Mn undergoes reduction. Thus, Statement-II is correct. Therefore, Statement-I is incorrect but Statement-II is correct. Answer: Statement-I is incorrect but Statement-II is correct.
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