Which of the following reactions should be balanced in basic medium?

Options

A. `NH_(3)+MnO_(4)^(ө)rarrMnO_(2)+NO_(2)`
B. `Cr(OH)_(2)+I_(2)rarrCr(OH)_(3)+2I^(ө)`
C. `HNO_(3)+Fe^(3+)+NO_(2)`
D. `H_(2)O_(2)+Fe^(3+)rarrO_(2)+Fe^(2+)`

Explanation

To determine which of the given reactions should be balanced in basic medium, we need to analyze the oxidation states of the elements involved and the nature of the reactants. Here's a step-by-step solution:

### Step 1: Identify the Reactions
First, we need to identify the reactions that are being considered. Let's assume the reactions are as follows:
1. Reaction involving nitrogen (N) and manganese (Mn).
2. Reaction involving nitric acid (HNO3) and iron (Fe).

### Step 2: Analyze the Oxidation States
- For the first reaction:
- Nitrogen is going from an oxidation state of -3 to +4.
- Manganese is going from +7 to +4.

This indicates that there is a redox process occurring, where nitrogen is being oxidized and manganese is being reduced.

- For the second reaction:
- HNO3 is an acid and typically reacts with metals like iron (Fe) to form ions such as Fe²⁺.

This reaction is generally balanced in acidic medium due to the presence of HNO3.

### Step 3: Determine the Medium for Balancing
- The first reaction involves hydroxide ions (OH⁻) and is specific to basic medium because of the involvement of OH⁻ ions in the reaction.
- The second reaction, involving HNO3 and Fe, is characteristic of acidic medium due to the presence of H⁺ ions from the acid.

### Step 4: Conclusion
Based on the analysis:
- The first reaction (involving nitrogen and manganese) should be balanced in basic medium.
- The second reaction (involving HNO3 and Fe) should be balanced in acidic medium.

Thus, the correct answer to the question "Which of the following reactions should be balanced in basic medium?" is **Option A and B** (assuming these correspond to the reactions involving nitrogen and manganese).