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(i) Cl 2 from HCl: HCl can be oxidised to chlorine by the number of oxidising agent for example By the action of any oxidising agent (whose oxidation potential is greater than Cl 2 ) on HCl MnO 2 + 4HCl → MnCl 2 + 2H 2 O + Cl 2 2KMnO 4 + 16HCl → 2KCl + MnCl 2 + 8H 2 O + 5Cl 2 (ii) HCl from Cl 2 : By the direct combination of elements i.e. hydrogen and chlorine in presence of sunlight. H 2 + Cl 2 →2HCl

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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

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549. How can you prepare Cl₂ from HCI and HCI from Cl₂?

(i) Cl₂ from HCl: HCl can be oxidised to chlorine by the number of oxidising agent for example
By the action of any oxidising agent (whose oxidation potential is greater than Cl₂) on HCl
MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂
2KMnO₄ + 16HCl → 2KCl + MnCl₂ + 8H₂O + 5Cl₂
(ii) HCl from Cl₂: By the direct combination of elements i.e. hydrogen and chlorine in presence of sunlight.

H₂ + Cl₂→2HCl