Question

Write the differentiate between white phosphorus and red phosphorus and black phosphorus

Answer 1

Answer:

White Phosphorus Properties:

1.Translucent in appearance like white waxy solid

2.Poisonous in nature

 3.Less stable and more reactive

4.Does not dissolve in water

5.When mixed with carbon disulphide it dissolves

6.Glows in the dark(chemiluminescence)

   Further, the white form of it dissolves in NaOH in an inert atmosphere giving PH3. The reaction that takes place is as follows:

                               P4+3NaOH+3H20→PH3+3NaH2PO2

Red Phosphorus Properties:

   Has iron grey lust-re

   Odorless

   Nonpoisonous

   Solubility properties: does not dissolve in water and carbon disulphide

   Does not glow in the dark

   Chemically, white phosphorus is more reactive than red phosphorus

   It is polymeric and consists of chains of P4 tetrahedron linked together as shown in the figure given below

Black Phosphorus properties:

α-black and β-black are two forms of black phosphorus. When red phosphorus is heated in a sealed tube at 803K, a α-black form is formed. It can be sublimed in the air and has either rhombohedral crystals or opaque monoclinic. It does not oxidise in the air. When white form is heated under high pressure at 473 K β-Black is formed. It does not burn in the air up to 673K.

Answer 2

Answer:

White Phosphorus consists of discrete tetrahedral molecules