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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?

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389. Which of the following does not react with oxygen directly?
Zn, Ti, Pt, Fe

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390.

Complete the following reactions
(i) C₂H₄ + O₂→
(ii) 4Al + 3O₂→

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