NCERT Class XII Chemistry <br> Chapter - The p-Block Elements <br> Questions with Solutions

NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

Question : 13

Total: 74

Write main differences between the properties of white phosphorus and red phosphorus.

Solution:

Property	White Phosphorus	Red Phosphorus
State	Translucent	Brittle substance(crystalline)
Colour	White, gets yellowish onexposure to light	Red
Odour	Garlic like odour	Odourless
Hardness	Soft like wax and can be cutby knife	Hard
Poisonous nature	Poisonous	Non-poisonous
Solubility	Soluble in CS2	Insoluble in CS2
Chemilumi-nescence	Glows in dark	Does not glow in dark
Density	1.80	2.10
Reactivity	Very reactive e	Less reactiv
Action ofchlorine	Burns readily in Cl2 formingPCl3 and PCl5	Combines with Cl2only on heatingforming first PCl3 andthen PCl5.

Structure of white and red phosphorus are given below :

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