When mangnese dioxide is fused with KOH in air, it gives

Options

A. Potassium permangante
B. Potassium manganate
C. manganese hydroxide
D. managanese sesquioxide

Answer

To solve the question "When manganese dioxide is fused with KOH in air, it gives," we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are manganese dioxide (MnO2) and potassium hydroxide (KOH). The presence of air indicates that oxygen (O2) is also involved in the reaction.

### Step 2: Write the Reaction
When manganese dioxide is fused with potassium hydroxide in the presence of air (oxygen), the reaction can be represented as:
\[ \text{MnO}_2 + \text{KOH} + \text{O}_2 \rightarrow \text{K}_2\text{MnO}_4 + \text{H}_2\text{O} \]

### Step 3: Balance the Reaction
To balance the reaction, we need to ensure that the number of atoms of each element is the same on both sides. The balanced equation is:
\[ 2 \text{MnO}_2 + 4 \text{KOH} + \text{O}_2 \rightarrow 2 \text{K}_2\text{MnO}_4 + 2 \text{H}_2\text{O} \]

### Step 4: Identify the Product
From the balanced equation, we can see that the main product formed is potassium manganate (K2MnO4), which is a green-colored compound.

### Step 5: Choose the Correct Option
Based on the products formed from the reaction, the correct answer to the question is:
- **Potassium manganate (K2MnO4)**

### Final Answer
The correct option is **Potassium manganate (second option)**.

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