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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.

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387. Write the order of thermal stability of the hydrides of Group 16 elements.

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388. Why is H₂O a liquid and H₂S a gas?

H₂O is a liquid at room temperture because it is highly associated via intermolecular hydrogen bonding. H₂S, due to large size of sulphur cannot form hydrogen bonding. Therefore, H₂S is a discrete molecule and the intermolecular forces of attraction are weak Van der Waal's forces. Hence, H₂,S is a gas at room temperature.