P Block 4
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trick for sulphur oxacids names
trick for sulphur oxacids structures
learn these two structures and then compare the structure given with the number of S in the compound if 2S then see the right structure and play with that and if 1S then see the LEft one compare the structure that matches with the one asked with the number of O pissing if there are more numbers of O then add it in between the S-S and if there are less number of O then remove the O from S and one exception is in H2SO5 add O in between S and OH https://www.youtube.com/watch?v=1th_jpRAEZs&list=PLHEUDUID1Uxvl-46mcBEAym-VxnOe8Y4r&index=13
SiF4 hydrolysis forms?
HNO3 with Cu (dilute)
Brown ring test reaction
PbO2 with HNO3 forms
reaction doesnt occurs
P-P bond or N-N bond which is stronger
P-P bond is stronger
White phosphorous is soluble in what
insolublein water but soluble in carbon disulphide
Red phosphorus structure
How is red phosphorous formed
Red phosphorus is obtained by heating white phosphorus at 573K in an inert atmosphere for several days.
How is black phosphorous formed
When red phosphorus is heated under high pressure, a series of phases of black phosphorus is formed.
Structure type of black P
opaque monoclinic or rhombohedral crystals
Which P is most thermodynamically stable
Black phosphorus is the most thermodynamically stable allotropic form of phosphorus.
How to make P4O6 from P4
P4 with HNO3 forms
Phosphine prepared by Ca3P2
add acid or water to it
P4 with NaOH
PH3 with contact with oxidizing agents like HNO3 does____
explodes
What happens in holme’s signals
The spontaneous combustion of phosphine is technically used in Holme’s signals. Containers containing calcium carbide and calcium phosphide are pierced and thrown in the sea when the gases evolved burn and serve as a signal. It is also used in smoke screens.
What is used in smoke screens
PH3
How is trichloride formed with P4
PCl5 color
yellowish white powder
Which oxoacid of P is reducing and what makes it reducing
Hypophosphorous acid is a good reducing agent as it contains two PH bonds and acids which contain PH bonds have strong reducing properties
P4O6 with H2O
