Give preparation and properties of PCl₅.

Solution

Preparation of PCl₅(i) It can be prepared by the action of excess of dry chlorine on phosphorus trichloride.
PCl₃ + Cl₂→PCl₅

(ii) It can also be prepared by the action of sulphuryl chloride (SO₂Cl₂) on phosphorus or phosphorus trichloride.

$P_{4} + 10 {SO}_{2} {Cl}_{2} \to 4 {PCl}_{5} + 10 {SO}_{2} {PCl}_{3} + {SO}_{2} {Cl}_{2} \to {PCl}_{5} + {SO}_{2}$

Properties:

(i) When heated, it sublimes at about 430 k and dissociates

${PCl}_{5} ⇌ {PCl}_{3} + {Cl}_{2}$

(ii) PCl₅ a yellowish white powder and in moist air, it hydrolyses to POCl₃ and finally gets converted to phosphoric acid.

PCl₅ + H2O → POCl₃ + 2HCl
POCl₃ + 3H2O → H₃PO₄ + 3HCl

Some More Questions From The p-Block Elements Chapter

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The P-Block Elements

Give preparation and properties of PCl₅.

Some More Questions From The p-Block Elements Chapter

Why are pentahalides more covalent than trihalides?

Why is BiH₃ the strongest reducing agent amongst all the hydrides of Group 15 elements?

Why is N₂ less reactive at room temperature?

Mention the conditions required to maximise the yield of ammonia.

What is the covalency of nitrogen in N₂O₅?

Bond angle in PH₄⁺ is higher than that in PH₃. Why?

Write a balanced equation for the hydrolytic reactions PCl₅ in heavy water.

Mock Test Series

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Entrance Exams Preparation

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The P-Block Elements

Give preparation and properties of PCl5.

Some More Questions From The p-Block Elements Chapter

Why are pentahalides more covalent than trihalides?

Why is BiH3 the strongest reducing agent amongst all the hydrides of Group 15 elements?

Why is N2 less reactive at room temperature?

Mention the conditions required to maximise the yield of ammonia.

What is the covalency of nitrogen in N2O5?

Bond angle in PH4+ is higher than that in PH3. Why?

Write a balanced equation for the hydrolytic reactions PCl5 in heavy water.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Give preparation and properties of PCl₅.

Why is BiH₃ the strongest reducing agent amongst all the hydrides of Group 15 elements?

Why is N₂ less reactive at room temperature?

What is the covalency of nitrogen in N₂O₅?

Bond angle in PH₄⁺ is higher than that in PH₃. Why?

Write a balanced equation for the hydrolytic reactions PCl₅ in heavy water.