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The p-Block Elements

Short Answer Type

531. Give the resonating structures of NO₂ and N₂O₅.

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532. The HNH angle value is higher than HPH, HAsH and HSbH angles. Why?

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Long Answer Type

533. Describe the molecular shape of BrF₃ on the basis of VSEPR theory.

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Short Answer Type

534. Explain why NH₃ is basic while BiH₃ only feebly basic.

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535. Nitrogn exists as diatomic molecule but phosphorus as P₄, Why?

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Long Answer Type

536. Write main differences between the properties of white phosphorus and red phosphorus.

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Short Answer Type

537. Why does nitrogen show catenation properties less than carbon and phosphorus?

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538. Give preparation and properties of PCl₅.

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539. Can PCl₅ act as an oxidising as well reducing agent? Justify.

PCl₅ can act as an oxidizing agent not as the reducing agent.

PCl₅ can act as an oxidizing agent. The highest oxidation state that P can show is +5. In PCl₅, phosphorus is in its highest state (+5). However, it can decrease its oxidation state and act as an oxidizing agent .

(i) PCl₅ is hydrolysed to give the oxoacid (H₃,PO₄) in the + 5 oxidation state.
PCl₅(s) + 4H₂O→ H₃PO₄ (aq) + 5HCl(aq)

(ii) In the gas phase, PCl₅ dissociates into trihalide and the chlorine.
${PCl}_{5} ⇌ {PCl}_{3} (g) + {Cl}_{2} (g)$

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Long Answer Type

540. Justify the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic configuraton, oxidation state and hydride formation.

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