KMnO4 decomposes on heating at 513 K to form O2 along with
- \(MnO_4^- , MnO_2\)
- \(K_2MnO_4 , MnO_2\)
- \(KMnO_4 , MnO_2\)
- \(MnO_2, H_2O\)
The Correct Option is B
Approach Solution - 1
To solve the problem of determining what substances are formed when potassium permanganate (\(KMnO_4\)) decomposes upon heating at 513 K, we need to understand the chemical decomposition reaction involved.
When \(KMnO_4\) is heated, it decomposes into potassium manganate (\(K_2MnO_4\)), manganese dioxide (\(MnO_2\)), and oxygen gas (\(O_2\)). The balanced chemical reaction for this decomposition is given by:
| \(2KMnO_4 \rightarrow K_2MnO_4 + MnO_2 + O_2\) |
Let's analyze the options:
- \(MnO_4^- , MnO_2\): This option mentions the manganate ion but lacks potassium.
- \(K_2MnO_4 , MnO_2\): This matches the known decomposition reaction products.
- \(KMnO_4 , MnO_2\): This does not involve any formation or release of oxygen, and \(KMnO_4\) is the reactant itself.
- \(MnO_2, H_2O\): Water (\(H_2O\)) is not a product of this decomposition reaction.
The only option that correctly represents the components formed by the decomposition of \(KMnO_4\) is:
- \(K_2MnO_4 , MnO_2\).
Thus, the correct answer is:
- \(K_2MnO_4 , MnO_2\)
Approach Solution -2
\(KMnO_4\) decomposes upon heating at 513 K and forms \(K_2MnO_4\) and \(MnO_2\).
\(2KMnO4 \xrightarrow{\Delta} K_2MnO_4 + O2 + MnO2\)
So, the Correct option is (B): \(K_2MnO_4\), \(MnO_2\)
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Concepts Used:
Chemical Bonding and Molecular Structure
Such a group of atoms is called a molecule. Obviously, there must be some force that holds these constituent atoms together in the molecules. The attractive force which holds various constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond.
Types of Chemical Bonds:
There are 4 types of chemical bonds which are formed by atoms or molecules to yield compounds.
- Ionic Bonds - Ionic bonding is a type of chemical bonding which involves a transfer of electrons from one atom or molecule to another.
- Covalent Bonds - Compounds that contain carbon commonly exhibit this type of chemical bonding.
- Hydrogen Bonds - It is a type of polar covalent bonding between oxygen and hydrogen wherein the hydrogen develops a partial positive charge
- Polar Bonds - In Polar Covalent chemical bonding, electrons are shared unequally since the more electronegative atom pulls the electron pair closer to itself and away from the less electronegative atom.
Factors Affecting Bond Enthalpy in Chemical Bonding:
- Size of the Atom
- Multiplicity of Bonds
- Number of Lone Pair of Electrons Present
- Bond Angle