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).
Top Questions on Preparation
- Zinc acetate - antimony trioxide catalyst is used in the preparation of which polymer?
- BITSAT - 2024
- Chemistry
- Preparation
- Predict the correct intermediate and product in the following reaction :
- NEET (UG) - 2017
- Chemistry
- Preparation
- The conversion of nitriles to aldehydes with stannous chloride in presence of $HCl$ is known as
- AMUEEE - 2015
- Chemistry
- Preparation
- The order of decreasing ease of abstraction of Hydrogen atoms in the following molecule is
- WBJEE - 2014
- Chemistry
- Preparation
- Grignard reagents and organolithium compounds on addition to dry ice separately, followed by hydrolysis gives
- AIIMS - 2013
- Chemistry
- Preparation
Questions Asked in JEE Main exam
- Let \( f: [0, 3] \to A \) be defined by \( f(x) = 2x^3 - 15x^2 + 36x + 7 \) and \( g: [0, \infty) \to B \) be defined by \( g(x) = \frac{x}{x^{2025} + 1}. \) If both functions are onto and \( S = \{ x \in \mathbb{Z} : x \in A { or } x \in B \} \), then \( n(S) \) is equal to:
- JEE Main - 2025
- Functions
Let A be a 3 × 3 matrix such that \(\text{det}(A) = 5\). If \(\text{det}(3 \, \text{adj}(2A)) = 2^{\alpha \cdot 3^{\beta} \cdot 5^{\gamma}}\), then \( (\alpha + \beta + \gamma) \) is equal to:
- JEE Main - 2025
- Matrix Operations
- Let \( P_n = \alpha^n + \beta^n \), \( P_{10} = 123 \), \( P_9 = 76 \), \( P_8 = 47 \), and \( P_1 = 1 \). The quadratic equation whose roots are \( \frac{1}{\alpha} \) and \( \frac{1}{\beta} \) is:
- JEE Main - 2025
- Sequences and Series
- A force of 49 N acts tangentially at the highest point of a sphere (solid of mass 20 kg) kept on a rough horizontal plane. If the sphere rolls without slipping, then the acceleration of the center of the sphere is:
- JEE Main - 2025
- Quantum Mechanics
- If \( \alpha \) and \( \beta \) are the roots of the equation \( 2z^2 - 3z - 2i = 0 \), where \( i = \sqrt{-1} \), then \[ 16 \cdot {Re} \left( \frac{\alpha^{19} + \beta^{19} + \alpha^{11} + \beta^{11}}{\alpha^{15} + \beta^{15}} \right) \cdot {Im} \left( \frac{\alpha^{19} + \beta^{19} + \alpha^{11} + \beta^{11}}{\alpha^{15} + \beta^{15}} \right) \] is equal to:
- JEE Main - 2025
- complex numbers