THE MPU HR SEC THE MPU HR SEC SCHOOLSCHOOL

PRESENTED BYPRESENTED BY M.A.MOSES SUSAI NATHANM.A.MOSES SUSAI NATHAN

J.NIJAMUDEENJ.NIJAMUDEEN C.P.SATHISHC.P.SATHISH M.SURENDARM.SURENDAR

M.DHINESH BABUM.DHINESH BABU

GUIDED BY C.D.ANURADHA

PHOSPHOROUS

Phosphorous is a non metal Phosphorous is a non metal placed inVA group of periodic placed inVA group of periodic

table . Its atomic number is 15.it table . Its atomic number is 15.it exhibits valency 3,5.exhibits valency 3,5.

It glows in dark and to mean the same it has been named

phosphorous.

Sources of phosphorous: phosphorous occurs in nature as

phosphates . Some of the chief ores of phosphorous are:

1.phosphorite,bone ash ca3(po4)2

2.chlorapatite 3ca3(po4)2cacl2

Extraction of phosphorous:bone ash contains phosphorous in the bone ash contains phosphorous in the form of calcium phosphate abundantly form of calcium phosphate abundantly . Hence phosphorous is extracted from . Hence phosphorous is extracted from

bone ash.bone ash.

(1)at 11500c,silica from sand reacts with calcium phosphate from bone ash to give phosphorous(v)oxide

and calcium silicate. Ca3(po 4)2+3sio2` Casio3+p2o5

Allotropes of phosphorous:An element may exist in various

forms which have different physical properties but same

chemical properties. This properties is called allotropy and the different forms of element are

called allotropes. The important allotropic forms of

phosphorous are white phosphorous and red

phosphorous

Conversion of white phosphorous into red phosphorous:

white phosphorous can be white phosphorous can be converted to red phosphorous converted to red phosphorous

by heating white phosphorous in by heating white phosphorous in presence of nitrogen to about presence of nitrogen to about

24024000C with a little iodine as C with a little iodine as catalystcatalyst..

Physical properties:1.white phosphorous is white waxy solid 1.white phosphorous is white waxy solid

with a smell of garlic and is poisonous. Red with a smell of garlic and is poisonous. Red phosphorous is odourless non poisonous red phosphorous is odourless non poisonous red

powder .powder .2.the ignition temperature of white 2.the ignition temperature of white

phosphorous is 30phosphorous is 3000C hence it can easily C hence it can easily catch fire. So it is kept preserved in water.catch fire. So it is kept preserved in water.

Phosphorous Acid Main ingredient H3PO4

Quality standard GB 2091-92

Main uses Used for making phosphate fertilizer, glycerin, phosphate, medicine, chemistry, reagent, etc.

Chemical properties :1.phosphorous burns in air forming

whit fumes of phosphorous (v) oxide

4p+5o2 2p2o5

2.whit phosphorous evolves phosphine (ph3) on warming with a

strong solution of caustic soda(sodium hydroxide)

4p+3naoh+3h2o ph3

+3nah2po2

red phosphorous does not react with caustic soda.

Uses of phosphorous:1. White phosphorous is used in

rat poison.2.red phosphorous is used in

match industry

Difference between white phosphorous and

red phosphorousProperty White

phosphorousRed

phosphorous

In carbon disulphide

Soluble Insoluble

In dark Glows No glow

Melting point

44oc 560oc

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