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Question

Which of the following statement regarding allotropic forms of phosphorus is incorrect?

A
Red phosphorus is polymeric in nature consisting of chains of P4 tetrahedra
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B
White phosphorus is more reactive than red and black phosphorus due to high angular strain
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C
Black phosphorus has two forms α-black and β-black phosphorus
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D
Red phosphorus on heating catches fire readily and gives dense red fumes of P4010
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Solution

The correct option is D Red phosphorus on heating catches fire readily and gives dense red fumes of P4010
(a) The three allotropic forms of phosphorus differ widely in their chemical reactivity in which white phosphorus is the most reactive while black and red phosphorus are less reactive.
White phosphorus is made up of discrete P4 tetrahedra which is subjected to very high angular strain as the angle is 60. This high angular strain makes white phosphorus unstable and highly reactive.

(b) White phosphorus on heating catches fire readily and gives dense white fumes of P4010. Unlike white phosphorus, red phosphorus does not ignite readily in air.​

(c) Red phosphorus is polymeric, consisting​ of chains of P4 tetrahedra linked together, forming a giant molecule.

(d) Black phosphorus has two forms α-black and β-black phosphorus.

Hence, option (b) is incorrect.

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