- Aredox reaction; 3 and 5
- Bredox reaction; +3 and +5
- Cdisproportionation reaction; 3 and +1
- Ddisproportionation reaction; 3 and +3
View written solutionFree
Correct answer: C
Step-by-step Solution:
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Identify the Reactants and Products: The question states that white phosphorus () reacts with aqueous NaOH. One product is given as phosphine (). We need to identify the other phosphorus-containing compound and the reaction type. The reaction is a well-known disproportionation reaction of white phosphorus in a hot, concentrated alkali solution. The unbalanced chemical equation is: The other product is sodium hypophosphite ().
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Determine the Oxidation States: To classify the reaction and find the required oxidation states, we calculate the oxidation state (O.S.) of phosphorus in the reactant and products.
- Reactant (White Phosphorus, ): In its elemental form, the oxidation state of phosphorus is 0.
- Product (Phosphine, ): Let the oxidation state of P be . Hydrogen has an oxidation state of +1 when bonded to a more electronegative non-metal like phosphorus. So, the O.S. of P in is -3.
- Other Product (Sodium Hypophosphite, ): Let the oxidation state of P be . Sodium (Na) is an alkali metal, so its O.S. is +1. Oxygen (O) generally has an O.S. of -2. Hydrogen (H) has an O.S. of +1. So, the O.S. of P in is +1.
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Determine the Reaction Type: In this reaction, the oxidation state of phosphorus changes from 0 in the reactant () to -3 in one product () and +1 in another product ().
- is a reduction (gain of electrons).
- is an oxidation (loss of electrons). Since the same element (phosphorus) from a single reactant is simultaneously oxidized and reduced, the reaction is a disproportionation reaction. A disproportionation reaction is a specific type of redox reaction.
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Match with the Options: We are looking for the option that correctly identifies:
- Reaction type: disproportionation reaction
- O.S. of P in phosphine: -3
- O.S. of P in the other product: +1
Let's evaluate the given options:
- A: redox reaction; 3 and 5. (Incorrect type and O.S.)
- B: redox reaction; +3 and +5. (Incorrect type and O.S.)
- C: disproportionation reaction; 3 and +1. (This matches our findings.)
- D: disproportionation reaction; 3 and +3. (Incorrect O.S. for the other product.)
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Conclusion: The reaction is a disproportionation reaction, and the oxidation states of phosphorus in phosphine and sodium hypophosphite are -3 and +1, respectively. Therefore, option C is the correct answer.
The balanced chemical equation for the reaction is:
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