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>>Class 12
>>Chemistry
>>The p-Block Elements
>>Phosphorus - Allotropic Forms
>> $Red phosphorus is less volatile than whi$

Question

Assertion

Red phosphorus is less volatile than white phosphorus

Reason

Red phosphorus has a discrete tetrahedral structure

Red phosphorus is less volatile than white phosphorus

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C

Assertion is correct but Reason is incorrect

D

Both Assertion and Reason are incorrect

Medium

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Solution

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Correct option is C)

Red phosphorus is less volatile than white phosphorus as its tendency to combust spontaneously is much less than white phosphorus.

Thus, Assertion is correct but Reason is incorrect

Hence, the correct option is $C$

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White phosphorus can be separated from red phosphorus by________.

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Red phosphorous is less soluble and less volatile than white phosphorous because of the formation its structure described as :

White phosphorus $(P_{4})$ has :

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Statement $-$ 1 : White phosphorus is less stable where as red phosphorus is more stable.

Statement $-$ 2 : White phosphorus exist as individual $P_{4}$ having more strained geometery while red phosphorus has $P_{4}$ tetrahedron structure linked together.

The order of densities of the various allotropes of phosphorus is as follows:
black phosphorus, red phosphorus, white phosphorus.

As tendency of polymerisation increases, the compactness of substance also increases.

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