P block Flashcards
ionisation enthaply order of N family
I) N > P> as > Sb > Bi
ii) N > P > As> Bi > Sb
iii) N> P > As> BI > SB
electronegativitity trnd of N
N> P > As> Sb = Bi
covalent and ionic radius of N
COvalent
= BI>Sb > AS> P > N
Ionic
As> P > N > BI> Sb
density of N group
HIgest = BI
Lowest N
Sb> As P
why is ioni enthalpy more for grp 15 than 14 in period because
of smaller size and stable half filled p orbital e configuration.
boiling point of N
Sb has more than Bi
melting point
increases upto arsenic and then decreases upto bismuth
which N group element forms metallic bond in elemental state
Bismuth
why catenation is weak in NN
than PP
as high interelectronic repoulsion of non bonding electrons
small bond lenght in N
Which bonds does NItrogen form
Ppi - P pi multiple bond with itself and other elecment having small size and high eng. but not heavier elements as their atomic orbitals are large, they cant have effective overlapping .
But NN cannot form DPi - P pi bonds
the only well characterised 5 oxidation stabte compnd with BI is
BiF5
trends of group 15 hydrides
BDenthalpy
NH3 , ph3 , ash3, sbh3, bih3
decreases
basicity - decreases
reducing character - increase
bond angle - decrease
booiling point
= PH3< Ash3< NH3< Sbh3< BIh3
disporportionation of N in acid solution
all 1 - 4 dispropo.
3HNO2= Hno3 + H20 + 2NO
trends of group 15 hydrides
thermal stability
NH3 , ph3 , ash3, sbh3, bih3
thermal stability decreases
what nitrogen halide is only stable
NF3
what is the only trihalide which is ionic
BIf3
pentahalides are more covalent than trihalides .
during commerial liquifaction , and frac distil, of air, which gas as liquid , distils first leaving behind which other gas
Ns, leaves o2
When Nh4cl reacts with X it releases gas Y , water and Nacl
what are small inpurities in this reaction , and how are they removed
X = Nano2
Y = N2
small amts of
NO and Hno3
removed by passing the gas through Aq h2so4 containing K2cr207
NH4cl reacts with X to give an important gas, a moisture absorber and water
NH4)2So4 reacts with Y to give the same gas, water and Z salt
X = ca(oh)2
gives Nh3 , water and cacl2
Y = NaOH
gives Nh3 , water and Z = Na2s04
Very pure N2 can be obtained by
Na or
Ba(N3)2 = Ba + 3 N2
when ammonia reacts with water, it gives an alkaline X
i ) when X reacts with Y = brown ppt Z + chloride
ii) X + N = white ppt C + aq soln of G
X = Nh4oh
Y = Fecl3
Z = fe203.xh20
amonium chloride
N = ammonium hydroxide
c + znoh2
G = nh4)2 so4
thermal decomposition of X gives N2 gas , water and which other Cr compound?
Decomp of
(NH4)2Cr207 when heated.
Cr203
habers process temperature = X
Delta h is =
X = 773 K
negative
N2 reacts with oxgen at 2000k to form which gas
N2+ O2 = 2 No
what ion reacts with ammonia to give deep blue complex D
what white ppt reacts with ammonia to give a colourless complex R
cu2+
D = Cu)NH3)4 )2+
white ppt = agcl
R = [ Ag(NH3)2]Cl
Decomposition of urea initially gives salt X
which on futher decomp gives 2 gases and water . name all
URea
Nh2CoNH2 =
(NH4)2CO3 =
2NH3 + H20 + Co2
catalyst in harbers process
Al203 + K20
iron oxide
Nh4no3 decomposes to form which gas and what is its oxidation state
N20
+1
2Nano2+ 2feso4 + 3 H2so4 gives which ferrous salt
ii) this salt when reacts with Nahso4 gives which gas what is its oxidation state
iii ) this gas produced when heated with N204 gives which other gas which what colour and acidic
Fe2(so4)3
the gas is NO
the last gas is N203
how many single bonds of N0 and double bonds between NO in N203
Sb = 1
Db = 2
which compound F decomposes to give Pb0 + gas R + another gas ( combustible )
ii) this gas R when cooled gives gas D which reacts with NO to give a blue acidic gas E
F = Pb(No3)2 ( high temp 673 )
R = NO2
02
this is brown colour and acidic
D = N204
E = N2o3
N204 and NO2 are in thermal equi ( reversible )
reaction of Nitric acid with compound X gives meta phosporic acid ( Hpo3) + gas y
X = P2(o)10
Y = N2o5
colourless and acidic
which oxides of nitrogen has NN bond
N - N - 0
N20
Number of N-O-N bonds
N=O bonds and
N-O bonds in N205
non = 1
n=o 2
n-o 2
no of Single NO bonds and Double NO bonds in n204
Sb = 4
Db = 2
why does NO2 dimerise
it contains odd number of valence electron , on dimerisation , it gets converted to stable N204 with even number of electrons.
what is formed in heating of chile saltpetre
with conc
Hno3
and Nahso4
xCu + y dil Hno3 = x ( Z ) + gas U
I) what happens ( what gas is produced) when Cu reacts with conc hno3 ,
3 cu
8 hno3
3 Cu(no3) 2
+ 2 NO
i ) when cu reacts with conc hno3,
it give No2 gas
upon catalytic oxidation of gas A stoichimetrically in 1:t ratio with oxigen , with what catalyst,
NO is formed.
A = Ammonia
t = 5
pt/ru gauge catalyst
nitric onxide ( no ) combines with o2 to give X
i ) this X dissolves in water to give which acid + which other gas
X = No2
dissoves in water to give Hno3
+ NO ( which was the maker of this gas initally )
reaction of I2 with excess of Hno3 ( 10 hno3 ) = x + y ( gas )
ii) reaction with carbon = U + y gas
iii ) reaction of 1 mole of S8 with d moles of Hno3 gives which acid and which gas
iv) reaction of 1 P4 with how many moles of nitric acid , gives what compound , and what gas
HIO3 + 10 NO2
ii) Co2 + NO2 ( both gases )
iii) D = 48 gives H2so4 and gas No2
iv ) 20 moles of hno3
= gives = 4H3po4 + 20 NO2
brown ring test depends on ability of what to what
fe2+ to reduce nitrates to nitric oxide which reacts with fe2+
