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The p-Block Elements

Short Answer Type

581.

Account for the following:
On addition of ozone gas to KI solution, violet vapours are obtained.

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582. SF₆ is known but SCl₆ is not known.

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583. NF₃ does not have donor properties like ammonia. Explain.

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584.

Write balance equations for the following reaction:
$Cu + conc . H_{2} {SO}_{4} \to$

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585.

Write balance equation for the following reaction:
${SF}_{4} + H_{2} O \underset{catalyst}{\to}$

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586.

Write balance equation for the following reaction:
$H_{2} S + {SO}_{2} \to$

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587.

Write balance equation for the following reaction:
$Te (s) + {Cl}_{2} (g) \to$

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588. PCl₅ exists as [PCl₆]^– [PCl₄]⁺ but PBr₅ exists as [PBr₄] + [Br]^–. Explain.

Both PCl₅ and PBr₅ have trigonal bipyramidal geometry. This is not a regular structure and is not very stable. Therefore, PCl₅ splits up into more stable octahedral and tetrahedral structures. Which are stable than trigonal bipyramidal.

{PCl}_{5} ⇌ {[{PCl}_{6}]}^{-} {[{PCl}_{4}]}^{+}

On the other hand, PBr₅ splits up into stable tetrahedral structure as [PBr₄]⁺ [Br]^{–
${PCl}_{5} ⇌ {[{PBr}_{4}]}^{+} {[Br]}^{-}$}This splitting is different from PCl₅ because Br atoms are large and six atoms of Br cannot be easily accommodated around smaller P atom.

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