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The p-Block Elements

Short Answer Type

381. What happens white phosphorus is heated with NaOH solution in an inert atmosphere of CO₂?

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382. What happens when PCl₅ is heated?

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383. Write a balanced equation for the hydrolytic reactions PCl₅ in heavy water.

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384. What is the basicity of H₃PO₄?

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385. What happens when H₃PO₃ is heated?

H₃PO₃,on heating, undergoes disproportionation reaction to form PH₃ and H₃PO₄. The oxidation numbers of P in H₃PO₃,PH₃, and H₃PO₄ are +3, −3, and +5 respectively. As the oxidation number of the same element is decreasing and increasing during a particular reaction, the reaction is a disproportionation reaction.
H₃PO₃ on heating disproportionates to give orthophosphoric acid and phosphine.
4H₃ PO₃→3H₃PO₄ + PH₃

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