P Block 3 Flashcards
Electronegativity tricks of P block Elements
draw Bhalla in the first two groups of the P blocks and then a little variation with the Bhalla being pressed downwards and then the last two will be pointed downwards like a sword
that would be the variations of elements
from the 3rd line there would be less more more
meaning the element will be Less/more compared to the diagonal in the upward period
trick for memorizing the names of oxyacids of phosphorous
draw the table and then match the things thats asked
metaphosphoric acid structure
Zeolites in which form and what does it do to hard water
hydrated zeolites are used as ion exchangers in softening of hard water
The basic structural unit of silicates is
SiO4 4-
Except for what element in grp 15 all the others show allotropy
N
What P and As compounds act as ligands and what kind of bond does it forms?!
dπ-dπ
Hydrides of grp 15 thermal stability, bond dissociation, basicity, reducing character, bond angle order
What oxides in grp 15 are amphoteric
arsenic and antimony
Which halide is covalent? pentalhalide or trihalide and why
pentahalide is more covalent because it has the O.S of the elements as 5 where as trihalides have O.S 3
PCl5 exists in the solid-state as
and why is it different than compared to PBr5
because Br is heavier and bigger and it would be difficult to accommodate Br around P as compared to Cl around P
Which only nitrogen halide is known stable
NF3
Very pure dinitrogen is obtained by
Dinitrogen is reactive/inert at room temperature and why?!
dinitrogen is inert at room temperature because of high enthalpy of the triple bond of N-N
N2 and O2 combines to form ___ at what condition
N2 and O2 combines to form NO at very high temperature*(2000K)
Urea formula
NH2CONH2
How forming ammonia with Urea
Catalyst used in habers process
K2O and Al2O3
What is used as an refrigent
liquid ammonia
Why does NH3 act as a lewis base
nitrogen atom in NH3 has one lone pair of electron which is available for donation
Cu2+ with Ammonia forms which complex and whats the color?
deep blue since Cu2+ has blue color
Nitrogen Oxides table
Nitrogen oxides structure
What kind of bonds does N2O5 has
covalent and coordinate covalent bonds
NH3 can be dried by?
by passing over fresh quicklime(CaO) or soda lime(NaOH & CaO)
Ammonia with sodium hypochlorite?
NaNO3 with H2SO4
Boiling point of the grp 15 hydrides
different type of oxides of grp15 thermal stability with acidity
PBr5 exis in the solid stae as
[PBr4]^+
Br^-
BiF3 is predominantly ionic or covalent?
inoic
NH4Cl + Ca(OH)2 forms
ammonoium sulfate with sodium hydroxide forms
why does NO2 dimerises
NO2 has an odd number of electrons and by dimerisation it is converted to a stable N2O4 molecule with even electrons
brown ring test compound and the O.S of Fe, NO
O.S. of Fe:- +1
O.S. of NO:- +1
whats a component of lead storage batteries and is also a amphoteric and strongly oxidizing agent
PbO2
why does SiCl6 ^2- doesn’t exists?
steric crowding around the atom
treated with CO2 forms
crystalline forms of silica name
quartz, tridymite and cristobalite
amorphous form of silica eg
kieselguhr
BH3is electron-deficient or electron sufficient compound and how does it behave(lewis acid or base)
its electron deficient and is a lewis acid
why is the carbon atoms’ lateral overlapping of 2pand 2p most effective
because it has a small size
eg of a 3-dimensional silicate?
feldspars
trialkylchlorosilane on hydrolysis gives?
CaF2 with SiO2+H2SO4 forms?
