When `K_(2)MnO_(4)` is added in solution of `NH_(4)Cl` then

Options

A. Green colour will appear
B. Yellow colour will appear
C. Pink colour will appear
D. Colour will appear

Answer

To solve the question "When K2MnO4 is added in solution of NH4Cl then...", we will analyze the reaction and determine the color change that occurs.

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this scenario are potassium manganate (K2MnO4) and ammonium chloride (NH4Cl).

2. **Understand the Reaction**: When K2MnO4 is added to NH4Cl, a redox reaction occurs. The manganate ion (MnO4^2-) is reduced to manganese dioxide (MnO2), while the ammonium ion (NH4^+) is oxidized.

3. **Write the Reaction**:
The balanced chemical equation for the reaction is:
\[ 2 KMnO_4 + 4 NH_4Cl \rightarrow 2 KMnO_4 + MnO_2 + 4 KCl + 4 NH_3 + 2 H_2O \]

4. **Identify the Colors of the Products**:
- Potassium manganate (K2MnO4) is green.
- Manganese dioxide (MnO2) is light brown.
- Potassium chloride (KCl) is colorless.
- Ammonia (NH3) is also colorless.

5. **Determine the Final Color**:
- Initially, K2MnO4 (green) is present.
- As the reaction proceeds, it produces MnO2 (light brown).
- The combination of green (from K2MnO4) and light brown (from MnO2) results in a yellowish color.

6. **Conclusion**: Therefore, when K2MnO4 is added to a solution of NH4Cl, the final color observed will be yellow.

### Final Answer:
The color that will appear is **yellow**.

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