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chemistry > Group 17 > Flashcards

Group 17 Flashcards

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1
Q

States and colours of 17th grp

A

F,Cl gas, Br liquid I solid
F YELLOW GAS
Cl pale greenish yellow
Bromine reddish brown gas
I purple violet

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2
Q

Electron affinity
Bond energy order

A

BA:Cl>Br >F>I
EA:Cl>F>Br>I

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3
Q

F2 is stronger oxidizing agent than Cl2

A

High hydration energy of F-
Low bond dissiciation

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4
Q

Which halogens react with water

A

F Cl
Br I are insoluble

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5
Q

Bp
Mp of hydrides of halogens

A

Bp Hcl<Hbr<HI<HF
MP HCL<HBr<HF<HI

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6
Q

Formation of halogen hydrides

A

Exothermic
Decreases

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7
Q

Which oxide of fluorine stable at 298K

A

OF2

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8
Q

O o Bond lengthin O2F2 H2O
OF BL

A

O O :O2F2< H2O2
O F: O2F2 >H2O2
OF2 >O2F2

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9
Q

Stablity of halogen oxides and why

A

I >Cl >Br
More polarizing more ionic
Multiple bond formation
Shows neither

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10
Q

Discuss abt the oxides of halogens

A

Fluoride strong oxidizing and fluoridation agents
Chloride highly reactive oxidizing agents
Clo2 used as bleaching agent
Bromine least stable exist at low temp powerful oxidizing agents
Iodine I2O4 I2O5 I2O7 Insoluble solids decompose on heating
I2O5 used for estimation of CO

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11
Q

Decreasing oxidizing ability of halogens in aq sol is dependent on

A

Electrode potential
Enthalpy of dissociation electron gain hydration energy

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12
Q

Reaction of F with water

A

It oxidizes water
F2+ H2O = HF +O2+ O3

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13
Q

Reation of CL BR I

A

Cl2 +H2O =HCl+ HOCl
Br2 +H2O =HBr +HOBr
I2 no reaction

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14
Q

F2+ NaOH dil and conc

A

Conc
HF O2 NaF
Dil
NaF OF2 H2O

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15
Q

Cl2 Br2 I2
With NaOH conc dil

A

Conc:NaCl +NaOCl3+ H2O
Dil: NaCl+ NaOCl+ H2O

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16
Q

Metal halides metal in lower oxidation states are more ionic

A

True

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17
Q

Fluorospar fluorite

A

CaF2

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18
Q

Anomalous properties of F2

A

One oxoacid ;most reactions are exothermic;HF only liquid hydride rest all gases

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19
Q

AgF Cafe MgF2 which are soluble in water

A

AgF2

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20
Q

Deccans process and its reagent

A

HCl+1/2O2=(cucl2) Cl2 +H2O
CuCl2

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21
Q

Weldons process

A

MnO2 +Hcl=MnCl2 Cl2 H2O

22
Q

KMnO4 and K2Cr2O7 +HCl decomposition

A

MnCl2+ KCl +Cl2 +H2O
KCl +CrCl3+ Cl2+ H2O

23
Q

How does cl exist as hydrated

A

Cl2.8H2O

24
Q

Cl2 h2o permanent or temporary

A

Permanent bleaching due to oxidation

25
Q

NH3 +cl2

A

Nh3 excess NH4Cl N2
Cl2 excess HCl NCl3

26
Q

CaOH)2 +Cl2= CaOCl2 H2O

A

Ca(OCl)2.CaCl2.Ca(OH)2.2H2O

27
Q

HCl+Fe

A

FeCl2 H2
No FeCl3 as it reduces to FeCl2

28
Q

Aqua Regia
Au and pt

A

Au= H[AuCl4] +NO+ H2O
Pt=H2[PtCl6]+NO+H2O

29
Q

Which oxide of Cl is para

A

ClO2

30
Q

Which oxide of Cl is a dimer

A

ClO3 Cl2O6

31
Q

Hydrolysis of Cl2O6

A

Cl2O6+ H2O= HClO3 +HClO4

32
Q

Hydrolysis of ClO2

A

ClO2=HClO2 +HClO

33
Q

Cl2O Cl2O7 hydrolysis

A

Cl2O =HOCl
Cl2O7= HClO4

34
Q

Clo2 prep

A

KClO3+H2So4 conc=KHSO4 +HClO4 +
ClO2

35
Q

Oxaacids of halogens are purely present in which state

A

Aqueous stable

36
Q

Hypohalous acid

A

HOCl HOF HOBr HOI

37
Q

Chlorine forms this acid only no other

A

HClO2 halousacid

38
Q

Halic and per helicopter acid

A

HClO3 HClO4

39
Q

Cl O bond length in oxoacids

A

ClO- >Clo2- >Clo3- >Clo4-

40
Q

Thermal STABILITY OF OXOACIDS

A

Hocl <HClO2 <HClO3 <HClO4

41
Q

Oxidising power

A

HOCl> HClO2> HClO3 >HClO4

42
Q

Which XX’ halogen least stable

A

IF

43
Q

Why are interhalogens more reactive than halogens

A

More polarity
Low bond ennergy

44
Q

Interhalogens are para or dia

A

Dia

45
Q

Which interhalogen is dimer
Planar or non planar

A

ICl3 I2Cl6 it is planar

46
Q

All possible XX3 XX5 XX7

A

ClF3 ClF5 IF7
BrF3 BrF5
IF3 IF5
ICl3

47
Q

What are pseudo halogens

A

(CN)2 (SCN)2

48
Q

On reaction with what CaOCl2 no bleaching action

A

CoCl2

49
Q

Nh3+CaoCl2

A

Nh3 excess
NH2-NH2+ CaCl2+H2O
CaOCl2 excess
N2+CaCl2 +H2O

50
Q

Cryolite
Phosgene
Tear gas

A

Na3AlF6
COCl2
CCl3NO2

51
Q

Mustard gas

A

ClCH2CH2SCH2CH2Cl

chemistry (5 decks)

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