phospohrus

Question 1

phosphorus os

Answer 1

+1, +4

Question 2

oxides of nitrogen and phosphorus are

Answer 2

acidic

Question 3

oxides of arsenic and antimony is

Answer 3

amphoteric

and of bismuth is basic

Question 4

white p is

Answer 4

waxy translucent poisonous insoluble in h2o but soluble in CS2

all angles are 60

Question 5

WHite p dissolves in naoh to give

it catches fire to give

Answer 5

PH3 and sodium hydrosulphite

P4O10

Question 6

red p

Answer 6

obtained by heating white phosphorus at 573K
in an inert atmosphere for several days.

odourless, nonpoisonous
insoluble in water and in carbon disulphide

Chemically, red phosphorus is much less reactive than white
phosphorus. It does not glow in the dark.

Question 7

alpha black p

Answer 7

α-Black phosphorus is formed when red phosphorus is heated in a sealed tube at 803K

opaque monoclinic or rhombohedral
crystals

Question 8

beta black p

Answer 8

β-Black phosphorus is prepared by
heating white phosphorus at 473 K under high pressure. It does not
burn in air upto 673

Question 9

phosgine prep

Answer 9

*calcium phosphide with water
or dilute HCl
* P4+NaOH+ H2O = PH3+ NaH2PO2