P Block 4 Flashcards
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
P4O10 with H2O
Grp 16 Electron affinity
Grp 16 melting point
Why is there are a large difference between MP and BP of O and S
the large different between the melting and boiling point of O and S may be explained on the basis of their atomicity oxygen exists as diatomic molecule whereas sulphur exists as polyatomic molecule (S8)
which grp 16 element is radioactive element
polonium(Po)
Reducing character of hydrides of grp 16
increases down the group
Which hydride doesn’t has reducing properties
H2O
HNO3 with Cu (conc)
HNO3(dil) with Zn
HNO3(conc) with Zn
PbO+HNO3
White phosphorous is poisonous/nonpoisonous
poisonous
White phosphorous structure
White phosphorous glow. true/falsee
true
white P is more reactive or red P
White P
two types of black P
alpha and beta - black P
how is alpha black P formed
α-Black Phosphorus is formed when red phosphorus is
heated in a sealed tube at 803K
how is beta black P formed?!
β-Black phosphorus is prepared by heating white phosphorus at 473 K under high pressure
PH3 smell and is it poisonous?
rotten fish smell and its highly poisonous
how is pentachloride formed with P4
whose bond dissocial enthalpy is more? O-O or S-S
S-S
