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chemistry > 16th Group > Flashcards

16th Group Flashcards

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1
Q

MP and BP of 16th group

A

O<S<Se<Te>Po</Te>

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2
Q

Oxygen ONo

A

-2,4,6 all except O
O shows -2,-1,1,2

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3
Q

Engel sulphur?

A

S6

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4
Q

What is alpha and beta sulphur?

A

Alpha is orthorhombic abc not same
a=b=c=90°
Beta monoclinic abc not same
A=b=90° c is not 90

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5
Q

Transition temp for alpha beta sulphur and which exists when

A

369°K T<369 Alpha more stable
T>369 beta more stable

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6
Q

Density solubility melting point if alpha beta sulphur

A

Density:alpha>beta
MP:alphA<beta
Solubility: insoluble in h2O solube in CS2

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7
Q

Which sulphur alotrope in paramagnetic?

A

S2

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8
Q

16th group hydrides states
Hybridization,reducing agent

A

H2O liquid rest all gases
Only h2o has hybridization rest all no
Reducing agent all except h20
It increases as BE decreses

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9
Q

Boiling and melting point of 16th grp hydrides

A

H2S<H2Se<H2Te<H2O

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10
Q

Oxygen and sulphur monopolies which as dimer

A

O only O2F2 always dimer ALL
S as S2F2 S2Cl2
open book structure

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11
Q

Se2Br2 disproportionate as

A

Se2Br2 =3Se +SeBr4

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12
Q

Se2Br2 disproportionate as

A

Se2Br2 =3Se +SeBr4

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13
Q

Which 16th gro element does not form dihalides tell abt them

A

Selenium and oxygen only OF2
Sulphur f,cl,br,
Te all

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14
Q

Does TeI2 and Te2I2 S2Br2 exist

A

Yes no no

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15
Q

Tetraflorides states if 16th group

A

SF4 gas SeF4 liquid TeF4 solid

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16
Q

Hexahalides go under hydrolysis?

A

No almost inert

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17
Q

Oxygen can be formed from decomposition of?

A

KCLO3=KCl+O2

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18
Q

Oxygen can also be formed from which oxides?

A

Higher ONo or decomposition of unstable like Ag2O,Pb3O4

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19
Q

H2O2 decomposition which reagent and its nature

A

MnO2 AMPHO

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20
Q

CATALYTIC OXIDATION EXAMPLES

A

SO2+O2=SO3 V2O5 AMPHO
HCl+O2=Cl2+H20

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21
Q

What is the colour of O2,O3

A

O2 colorless gas blue liquid
O3 pale blue gas,deep blue liquid,dark violet solid

22
Q

Ozone is formed by

A

Silent electric discharge (ozoniser for pure )

23
Q

Ozone is odorless so is oxygen

A

Ozone has characteristics smell
O2 no

24
Q

Ozone is stable at sealevel

A

No dangerously explosive
Thermodyanamically unstable

25
Q

Ozone bond length and angle

A

BL=128A°
BA 117

26
Q

Ozone strong oxidizing converts
PbS,H2S,I-,HCL

A

Pbso4 o2,s h2o o2,cl2 h20 o2
O2 always formed except so2+o2=so3
H2o2+o2=h2o+o2

27
Q

Estimation of O3

A

KI+O3+H2O=I2+KOH+O2
I2+Na2S2O3=Na2S4O6+NaI
Thonic acid oleum pyrosulphuric

28
Q

Qualitative estimation of O3

A

Hg+O3=HgO +O2
Non sticky to sticky
KOH+O3=KO3(orange yellow) paramagnetic

29
Q

MnO2 ,CrO3 V2O4 CuO FeO
Ampho?
Basic?
Acidic?

A

Am=MnO2
Ba=cuo,feo v204
Ac=CrO3

30
Q

V2O5,MnO,Fe2O3,Mno7,Mn3O4

A

Ampho v2o5 fe2o3,mn3o4
Aci mno7
Ba MnO

31
Q

S6 STRUCTURE

A

Chair form

32
Q

NO RAPIDLY REACTS WITH O3 TO GIVE

A

NO+O3=NO2 O2
CAUSE FOR OZONE DEPLETION

33
Q

AL2O3 +HCL
+NACL

A

Al(H2O)6)+3
Na3[Al(OH)6]

34
Q

SO2 PREP WITH S
Ores

A

S+ O2 =SO2
FeS2+ O2= FE2O3 SO2

35
Q

M2S+conc hcl=

A

SO2

36
Q

CaSO3+HCl=

A

CaCl2+SO2+H2O

37
Q

SO2+H2O
+NAOH
Na2SO3+H2O

A

H2SO3
Na2SO3
NaHSO3

38
Q

Difference between SO2 CO2

A

So2 decolourises KMnO4 K2Cr2O7
Reducing agent

39
Q

OXIDISING PROPERTIES OF SO2
SO2+H2S
SO2+HI
SnCl2+SO2+HCl

A

S+h2o
I2+s+h2o
SnCl4+S+H2O

40
Q

SO2+KMNO4+H2O
SO2+K2Cr2O7+H2SO4

A

K2SO4+H2SO4+MnSO4
K2SO4+Cr2(SO4)3+H2O

41
Q

So2+cl2

A

SO2Cl2 on charcoal
Sulphurly chloride

42
Q

Cl2+So2+h2o

A

H2SO4+HCl

43
Q

How is H2SO4 prepared

A

S+O2= SO2
SO2 +O2 =(V2O5) SO3
SO3+H2SO4=H2S2O7
H2S2O7 upon dilution gives H2So4

44
Q

The arsenic impurities while contact process removed by?

A

Fe(OH)3

45
Q

Contact process exo or endo
Favorable cond

A

Exo
Low temp
High pressure

46
Q

H2so4 strong dehydrating agent charing process

A

C12H22O11+ H2SO4= C +H2O

47
Q

Zn +H2SO4 DIL AND Conc

A

Dil:ZnSO4+H2
Conc:ZnSo4+H20+So2

48
Q

Conc H2so4+HI=I2+SO2+H20

A
49
Q

H2So4 +Pcl5

A

SO2Cl2+POCl3+HCl

50
Q

P4+SO2CL2
P4+SOCL2

A

PCL5+SO2
PCL3+SO2+S2CL2

51
Q

So2+Pcl5

A

Socl2+POCL2

chemistry (5 decks)

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