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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?

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386. List the important source of sulphur.

The abundance of sulphur in the earth crust is 0.03-0.1%. Combined sulphur exist primarily as sulphates such as gypsum CaSO₄. 2H₂,O, epsom salt MgSO₄.7H₂ O, baryte BaSO₄ and sulphides such as galena PbS, zinc blende ZnS copper pyrite CuFeS₂. Traces of sulphur occur as hydrogen sulphide in volcano. Organic minerals such as eggs, proteins, garlic, onion, mustard, hair and wool contain sulphur.

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