Assertion :In P4, the valency and oxidation number of phosphorous are same. Reason: In the reaction between phosphorous and sodium hydroxide, phosphorous acts as both oxidising and reducing agent.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is D Both Assertion and Reason are incorrect The oxidation number of phosphorus in P4 is zero. However, the valency of phosphorus in P4 is three because each P atom is attached to three other P atoms. In the reaction between phosphorus and N, the oxidation state of phosphorus changes for 0 to +3 and +1. The oxidation state of other atoms remains same. Thus, phosphorus undergoes disproportion reaction. P4+3NaOH+3H2O→3NaH2PO2+PH3.