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Like white phosphorus, which phosphorus also exists as P4?(a) Black phosphorus(b) Red phosphorus(c) Phosphine(d) Beta-black phosphorusI got this question during an online exam.I want to ask this question from P-Block Elements topic in section P-Block Elements of Chemistry – Class 12

Answer»

The correct option is (b) Red phosphorus

The EXPLANATION is: Like white phosphorus, red phosphorus ALSO EXISTS as P4 tetrahedra but these are joined together through COVALENT bonds to give a polymeric STRUCTURE. Because of polymeric structure, its melting point (883 K) is much higher than that of white phosphorus(317 K).



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