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12 grade stuff > gr 16 > Flashcards

gr 16 Flashcards

1
Q

typical non metals

A

o

s

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2
Q

metalloid behaviour

A

Se Te

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3
Q

halflife of TE

A

13.8 days

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4
Q

who all r octa atomic

A

S
Se
Te

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5
Q

most abundant element in earths crust

A

O

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6
Q

Po is found as

A

decay product of Ur and thorium

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7
Q

hydride with highest bp

A

h2o

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8
Q

hydride w least bp

A

h2s

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9
Q

only liquid hydride

A

h2o rest are gas

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10
Q

B A trend among hydrides

A

decrease down the group

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11
Q

B E trend among hydrides

A

decrease dtg

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12
Q

acidity among hydride trend

A

increase dtg

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13
Q

H2s pptys

A

colorless
poisonous
rotteen egg smell

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14
Q

prep of h2s

A

kips reaction
hydrolysis of Al2S3
hydrolysis of thioacetamide

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15
Q

prep of pure h2s

A

antimony + dil. HCl

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16
Q

what is kips rxn

A

FeS + h2so4 = h2s + feso4

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17
Q

bond ange between h2s-

A

92.5

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18
Q

state of
SO2
seo2
teo2

A

SO2 - gas
seo2 - solids
teo2 - solids

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19
Q

so3
seo3
teo3

A

so3 - gas / solid
seo3 cyclic tetramer
teo3 3d covalent giant molecule

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20
Q

why seo2 and teo2 solids

A

polymeric solids

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21
Q

are all bonds in so3 same

A

no
2- p ‘’ - d’’
1- p’‘-p’’

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22
Q

how many forms of so3 solid and what are they

A

3 , alpha beta gama

23
Q

which two forms of so3 are interconvertible

A

alpha and beta

24
Q

which form is most stable and why

A

gama becs cyclic tetraer

25
Q

structure of seo3

and teo3

A

seo3- cyclic tetramer

teo3- o attached to edge octahedral atoms

26
Q

stability of halides

A

decrease from f- i

27
Q

why is sf6 inert

A

its resistant to hydrolysis gasesous insulators

28
Q

all tetrahalides are

A

see saw shaped

29
Q

how is sf4 prepared

A

flurinating scl2 with naf in presence of MeCN

30
Q

best fluorinating agent

A

sf4

31
Q

uses of sf4

A

convert
cooh- cf3
co- cf2
po- pf2

32
Q

which dihalide doesnt exist and why

A

Se becs thermodynamically unstable

33
Q

what is s2cl2 and structure

A

monohalide, non linear, dimer

34
Q

what is SE2cl2

A

dimer non linear monohalie

35
Q

uses of s2cl2

A

volacanisation of rubber

36
Q

o2 - para or di

A

para

37
Q

completely absorbed by

A

alkaline pyrogallol

38
Q

ppty of pyro gallol

A

biscuit colored solid

39
Q

prep of o2

A 
a. heating oxygen rich source like chlorate or nitrates
    in presence of MnO2 as catalyst
b. moderate heating of heavy metal oxide
     i.e, heating of Hgo or Ago
c.  burning of mixed oxides
d. decomposition of h2o2
e. electrolysis of acidified water
f. brins process- decomposition of Bao2 in steps
g. heating bleachin powder w Co salt
40
Q

what happens when berthelot salt is heated

A

gives o2

kclo3 is berthelot salt - oxygen rich

41
Q

pptys of o2

A

easily liquified- pale blue colored
has 2 named rxns-
a. ostwalds process- manufacture of NO
b. deacons process- manufacture of cl2 by ( hcl + o2)

42
Q

uses of o2

A

life sustenance
produce welding flame ( o2 + actelene)
for rocket propellants
combustion fuels

43
Q

what are sub oxides

A

E —E—-O bond containing oxides

44
Q

polyxide

A

% of oxy is higher - peroxide or superoxide

45
Q

nature of transition metal oxides

A

acidic

46
Q

nature og na2o mgo

A

basic

47
Q

o3 pptys

A 
diamag
pale blue gas solid
fishy smell
deep blue liquid, violet black solid 
act as oxidant only
high +ve rp
48
Q

why is o3 thermodynamically unstable

A

it spontaneously decomposes to formm o2

49
Q

cautions of high conc o3

A

explosive

50
Q

inhalation of o3 causes

A

nausea dizziness

51
Q

soluble in

A

non polar liquid- turpentine cinnamon oil ccl4

INSOLUBLE IN WATER

52
Q

is it denser than air

A

yes 1.67 times

53
Q

lab prep of o3

A

silent electric discharge thru dry oxygen
endothermic, decrease in volume
to prevent sparkles , carried out in siemens ozoniser
to increase conc pass thru batterised ozoniser like BRODIES OZONISER

54
Q

reaction of o3

A

PbS + o3 = pbso4 (white) + o2
depleltion of o3 layer by reacting with NO and forming o2 and no2
estimate o3 by idometry - 1 mol { ph = 9.2 by borate buffer}

12 grade stuff (8 decks)

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