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inorganic chemistry > p block(c fam) > Flashcards

p block(c fam) Flashcards

C fam

1
Q

caarbon family

A

carbon
silicon
germinium
tin
lead
flerovium

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2
Q

elemental forms of carbon

A

graphite,diamond,coal

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3
Q

combined state of carbon

A

metal carbonates,hydrocarbons,CO2 in air

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4
Q

silicon present in nature as

A

silica and silicates

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5
Q

tin occur as

A

cassiterite

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6
Q

lead occur as

A

galena

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7
Q

who seen in tracce amout

A

germinium

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8
Q

valence shell Ec

A

ns2np2

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9
Q

increment of covalent radius

A

considerable increase from c to si ,si to pb small increase

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10
Q

reason for small increment in size from si to lead

A

due to presence of completely filled d and f orbitals in heavier atoms

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11
Q

IE

A

first IE is grreater than group 13.
generally decreases down the group

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12
Q

EN

A

more EN than grp 13.EN values from si to pb are almost same

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13
Q

physical propertiess

A

all are solids.
C and Si - non metals.
Ge - metalloid
Pb - soft metal

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14
Q

grp 14 elements have 4 electrons in outermost shell.common oxidation state?

A

+4 and +2

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15
Q

did carbon exhibits negative oxn state

A

yes

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16
Q

compounds in +4 oxn state generally covalent in nature .why

A

since the value of sum of first 3 IE are high

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17
Q

in heavier members the tendancy to shoe +2 state …

A

increases

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18
Q

most positive electron gain enthalpy (high)

A

Neon

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19
Q

all members when heated with oxygen forms oxides,in the form of

A

monoxide and dioxide

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20
Q

do they react with water

A

C,Si,Ge are unaffected by water.
Sn decompposes steam to form dioxide and dehydrogen.
Pb is unaffected

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21
Q

why pd is unafffected by water

A

it forms a protective oxide film

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22
Q

these elements can form halides of the formula

A

MX2 and MX4

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23
Q

do C react with halogen

A

no

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24
Q

sitric acid

A

Si(OH)4

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25
Q

anomolous behaviour of C

A

small in size,high EN,high IE,unavailability of d orbital

26
Q

why covalency of C is limitted to 4 and others can expand their covalency

A

cos s and p orbitals of C is taking part in bonding..hence it can accomodate only 4 pair of electrons..others have d orbital and they can expand their covalency

27
Q

catenation?

A

carbon have the tendancy to link with one another through covalent bonds to form chains and rings

28
Q

how catenation possible in
C?

A

it has the ability to form ppi-ppi bond
small size
high EN

29
Q

allotropes of Carbon

A

diamond,graphite,fullerene

30
Q

order of IE

A

C>Si>Ge>Pb>Sn

31
Q

hybridisation of diamond

A

sp3

32
Q

enthalpy of formation of diamond

A

1.90KJ/mol

33
Q

in diamond a carbon linked to four carbon in …….. faashion

A

tetrahedral

34
Q

c-c bond length in diamond

A

154pm

35
Q

in this structure ……….. covalent bonds are present

A

directional

36
Q

hardest substance on the earth

A

diamond

37
Q

it is used as an abrasive sharpening hard tools.which?

A

diamond

38
Q

1 carat diamond

A

200mg

39
Q

hybridisation of graphite

A

sp2

40
Q

enthalpy of formation of graphite

A

0

41
Q

in graphote layers are held by ……. force

A

van der waals force

42
Q

distance btw 2 layers

A

340pm

43
Q

each layer is composed of …………. rings of carbon atom

A

planar hexogonal rings

44
Q

c-c bond length within in the layer

A

141.5pm

45
Q

types of bonds btw carbon atom in hexagonal ring

A

3 sigma bonds btw 3 carbon atom.4th electrons forms pi bond

46
Q

why graphites conduct electricity?

A

electrons are mobile over the whole sheet

47
Q

graphite is used as a dry lubricant in machines running at high temperature,where oil cant be used .why?

A

graphites cleave easily btw the layers and therfore it is very soft and slippery

48
Q

which is the most pure form of carbon.and its hybridisationn?

A

fullerene,sp2

49
Q

how fulllerenes are prepared?

A

by heating graphite in an electric arc in the presence helium or argon..then condeses out C60 with C70 and other fullerenes

50
Q

C60 named as

A

Buckminster fullerence

51
Q

general name …….. refers to the family of spheroidal carbon cage molecules

A

fullerence

52
Q

shape of C60

A

soccer ball

53
Q

C60 contains

A

12 five membered ring
20 six membered rings
six membered rrings are fused to 5 membered rings and other 6 membered rings but 5 membered rings are only fused to 6 membered rings

54
Q

both c-c single bond and double bond are present in this structure

A

yes

55
Q

which are the impure amorphous forms of graphites or fullerenes

A

carbon black,coke,charcoal

56
Q

……. is formed by burning hydrocarbon in limited air supply

A

carbon black

57
Q

charcoal and coke are obtained by

A

heating wood and ccoal respectively in absence of air

58
Q

why graphite is used for electrodes in batteries and industrial electrolysis.why?

A

graphite is a good conductor

59
Q

…… made from graphite are inert to dil. acids and allkalies

A

crucibles

60
Q

being highly porous,activated charcoal is used in

A

adsorbing poisonous gas

inorganic chemistry (7 decks)

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