Given below are two statements.
Statement I: Iron (III) catalyst, acidified \(K_2Cr_2O_7\) and neutral \(KMnO_4\) have the ability to oxidise \(I^–\) to \(I_2\) independently.
Statement II: Manganate ion is paramagnetic in nature and involves \(pπ – pπ\) bonding.
In the light of the above statements, choose the correct answer from the options given below.
Statement I: Iron (III) catalyst, acidified \(K_2Cr_2O_7\) and neutral \(KMnO_4\) have the ability to oxidise \(I^–\) to \(I_2\) independently.
Statement II: Manganate ion is paramagnetic in nature and involves \(pπ – pπ\) bonding.
In the light of the above statements, choose the correct answer from the options given below.
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is true but Statement II is false
- Statement I is false but Statement II is true
The Correct Option is B
Approach Solution - 1
To solve this problem, we need to evaluate the truthfulness of both given statements regarding chemical properties and reactions.
Statement I: Iron (III) catalyst, acidified \(K_2Cr_2O_7\) and neutral \(KMnO_4\) have the ability to oxidize \(I^–\) to \(I_2\) independently.
Explanation: Iron (III) does not act as an oxidizing agent to oxidize iodide \(I^–\) to iodine \(I_2\). Although acidified potassium dichromate \(K_2Cr_2O_7\) can oxidize \(I^–\) to \(I_2\), neutral potassium permanganate \(KMnO_4\) cannot effectively oxidize iodide ions in the neutral medium. Therefore, Statement I is false.
Statement II: Manganate ion is paramagnetic in nature and involves \(pπ – pπ\) bonding.
Explanation: The manganate ion \(MnO_4^{2-}\) is actually diamagnetic because all of its electrons are paired in the tetrahedral structure. Furthermore, \(dπ-pπ\) bonding, not \(pπ-pπ\), is typically involved. Therefore, Statement II is false.
Given the analyses, the correct option is: Both Statement I and Statement II are false. This conclusion is drawn based on the incorrect nature of both statements, as explained above.
Approach Solution -2
Manganate ion \(MnO_4^{2-}\)has tetrahedral structure has only \(dπ – pπ\) \(π-bonds\).
\(Fe^{3+}\) is not used as a catalyst in the conversion of \(I^–\) to \(I_2\) by \(K_2Cr_2O_7\).
\(K_2Cr_2O_7\) oxidise \(I^–\) in acidic medium easily.
The correct answer is (B): Both Statement I and Statement II are false
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Concepts Used:
Catalysis
All reactants need to overcome certain energy, better known as activation energy in order to form products. This activation energy is the difference between the energy of the transition state and the reactant species.
Types of Catalysis:
Catalysis of chemical reactions is generally divided into two categories:
- Homogeneous Catalysis: Homogeneous catalysis of chemical reactions is a process where the reactants involved in the reaction and the catalyst are in the same phase. For example hydrolysis of sugar in the presence of sulphuric acid.
- Heterogeneous Catalysis: Heterogeneous catalysis of chemical reactions is a process where the reactants involved in the reaction and the catalyst are in different phases. For example reaction of hydrogen and nitrogen in the presence of finely divided iron to form ammonia.