Preparation of potassium permanganate from MnO\(_2\) involves a two-step process in which the 1st step is a reaction with KOH and KNO\(_3\) to produce:
Show Hint
- \( K_4[{Mn(OH)}_6] \)
- \( K_3{MnO}_4 \)
- \( {KMnO}_4 \)
- \( K_2{MnO}_4 \)
The Correct Option is D
Solution and Explanation
Preparation of Potassium Permanganate (\( \text{KMnO}_4 \)) from Manganese Dioxide (\( \text{MnO}_2 \))
Given: The preparation of potassium permanganate involves two steps. In the first step, manganese dioxide (\( \text{MnO}_2 \)) reacts with potassium hydroxide (KOH) and potassium nitrate (\( \text{KNO}_3 \)) to form potassium manganate (\( \text{K}_2\text{MnO}_4 \)).
Step 1: The reaction
The reaction is as follows: \[ \text{MnO}_2 + 4 \text{KOH} + 2 \text{KNO}_3 \to \text{K}_2\text{MnO}_4 + 2 \text{H}_2\text{O} \] - Manganese dioxide reacts with potassium hydroxide and potassium nitrate to produce potassium manganate and water.
Conclusion:
The product of the first step is \( \boxed{\text{K}_2\text{MnO}_4} \), which corresponds to option (4).
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