16th Group Flashcards
MP and BP of 16th group
O<S<Se<Te>Po</Te>
Oxygen ONo
-2,4,6 all except O
O shows -2,-1,1,2
Engel sulphur?
S6
What is alpha and beta sulphur?
Alpha is orthorhombic abc not same
a=b=c=90°
Beta monoclinic abc not same
A=b=90° c is not 90
Transition temp for alpha beta sulphur and which exists when
369°K T<369 Alpha more stable
T>369 beta more stable
Density solubility melting point if alpha beta sulphur
Density:alpha>beta
MP:alphA<beta
Solubility: insoluble in h2O solube in CS2
Which sulphur alotrope in paramagnetic?
S2
16th group hydrides states
Hybridization,reducing agent
H2O liquid rest all gases
Only h2o has hybridization rest all no
Reducing agent all except h20
It increases as BE decreses
Boiling and melting point of 16th grp hydrides
H2S<H2Se<H2Te<H2O
Oxygen and sulphur monopolies which as dimer
O only O2F2 always dimer ALL
S as S2F2 S2Cl2
open book structure
Se2Br2 disproportionate as
Se2Br2 =3Se +SeBr4
Se2Br2 disproportionate as
Se2Br2 =3Se +SeBr4
Which 16th gro element does not form dihalides tell abt them
Selenium and oxygen only OF2
Sulphur f,cl,br,
Te all
Does TeI2 and Te2I2 S2Br2 exist
Yes no no
Tetraflorides states if 16th group
SF4 gas SeF4 liquid TeF4 solid
Hexahalides go under hydrolysis?
No almost inert
Oxygen can be formed from decomposition of?
KCLO3=KCl+O2
Oxygen can also be formed from which oxides?
Higher ONo or decomposition of unstable like Ag2O,Pb3O4
H2O2 decomposition which reagent and its nature
MnO2 AMPHO
CATALYTIC OXIDATION EXAMPLES
SO2+O2=SO3 V2O5 AMPHO
HCl+O2=Cl2+H20
What is the colour of O2,O3
O2 colorless gas blue liquid
O3 pale blue gas,deep blue liquid,dark violet solid
Ozone is formed by
Silent electric discharge (ozoniser for pure )
Ozone is odorless so is oxygen
Ozone has characteristics smell
O2 no
Ozone is stable at sealevel
No dangerously explosive
Thermodyanamically unstable
Ozone bond length and angle
BL=128A°
BA 117
Ozone strong oxidizing converts
PbS,H2S,I-,HCL
Pbso4 o2,s h2o o2,cl2 h20 o2
O2 always formed except so2+o2=so3
H2o2+o2=h2o+o2
Estimation of O3
KI+O3+H2O=I2+KOH+O2
I2+Na2S2O3=Na2S4O6+NaI
Thonic acid oleum pyrosulphuric
Qualitative estimation of O3
Hg+O3=HgO +O2
Non sticky to sticky
KOH+O3=KO3(orange yellow) paramagnetic
MnO2 ,CrO3 V2O4 CuO FeO
Ampho?
Basic?
Acidic?
Am=MnO2
Ba=cuo,feo v204
Ac=CrO3
V2O5,MnO,Fe2O3,Mno7,Mn3O4
Ampho v2o5 fe2o3,mn3o4
Aci mno7
Ba MnO
S6 STRUCTURE
Chair form
NO RAPIDLY REACTS WITH O3 TO GIVE
NO+O3=NO2 O2
CAUSE FOR OZONE DEPLETION
AL2O3 +HCL
+NACL
Al(H2O)6)+3
Na3[Al(OH)6]
SO2 PREP WITH S
Ores
S+ O2 =SO2
FeS2+ O2= FE2O3 SO2
M2S+conc hcl=
SO2
CaSO3+HCl=
CaCl2+SO2+H2O
SO2+H2O
+NAOH
Na2SO3+H2O
H2SO3
Na2SO3
NaHSO3
Difference between SO2 CO2
So2 decolourises KMnO4 K2Cr2O7
Reducing agent
OXIDISING PROPERTIES OF SO2
SO2+H2S
SO2+HI
SnCl2+SO2+HCl
S+h2o
I2+s+h2o
SnCl4+S+H2O
SO2+KMNO4+H2O
SO2+K2Cr2O7+H2SO4
K2SO4+H2SO4+MnSO4
K2SO4+Cr2(SO4)3+H2O
So2+cl2
SO2Cl2 on charcoal
Sulphurly chloride
Cl2+So2+h2o
H2SO4+HCl
How is H2SO4 prepared
S+O2= SO2
SO2 +O2 =(V2O5) SO3
SO3+H2SO4=H2S2O7
H2S2O7 upon dilution gives H2So4
The arsenic impurities while contact process removed by?
Fe(OH)3
Contact process exo or endo
Favorable cond
Exo
Low temp
High pressure
H2so4 strong dehydrating agent charing process
C12H22O11+ H2SO4= C +H2O
Zn +H2SO4 DIL AND Conc
Dil:ZnSO4+H2
Conc:ZnSo4+H20+So2
Conc H2so4+HI=I2+SO2+H20
H2So4 +Pcl5
SO2Cl2+POCl3+HCl
P4+SO2CL2
P4+SOCL2
PCL5+SO2
PCL3+SO2+S2CL2
So2+Pcl5
Socl2+POCL2
