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The p-Block Elements

Short Answer Type

541. Why is dioxygen a gas but sulphur a solid?

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542. What is the covalency of nitrogen in N₂O₅?

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543. Explain why both N and Bi do not form pentahalides while phosphorus does.

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544. What is the covalency of nitrogen in N₂O₅?

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545. Explain why both N and Bi do not form pentahalides while phosphorus does.

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546. Account for the following observations:
among the halogens, F₂, is the strongest oxidising agent?

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547. Account for the following observations:
fluorine exhibits only-1 oxidation state whereas other halogens exhibit positive oxidation states also.

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548. Account for the following observations:
acidity of oxo acid of chlorine is HOCl < HOCIO < HOClO₂ < HOClO₃

The acid strength increases:HOCl < HOCIO, < HOCIO₂, < HOCIO₃.
electronegativity play a role in acid strength.There are conclusions we might draw. A greater electronegativity of the atom or atoms attached to the H-O in the oxyacid apparently results in a weaker H-O bond, which is thus more readily ionized.
Since number of oxygen atom increase thus there acidic chracter is also increases.

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