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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?

Nitrogen has a very little tendency to show catenation as N—N bond is very weak because of the repulsion in the electron pairs on the nitrogen atom. Nitrogen forms a chain of two atoms as in N≡ N, hydrazine H₂N—NH₂ and of three atoms as in azide ion, N₃^–. Carbon can form a chain of several carbon atoms. The change in behaviour in carbon and nitrogen is due to weakness of the N—N single bond which in turn may be due to repulsion between lone pair of electrons on the two adjacent nitrogen atoms.

Phosphorus exists as discrete tetra atomic (P₄).

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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.

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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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