gr 16

Question 1

typical non metals

Answer 1

o

s

Question 2

metalloid behaviour

Answer 2

Se Te

Question 3

halflife of TE

Answer 3

13.8 days

Question 4

who all r octa atomic

Answer 4

S
Se
Te

Question 5

most abundant element in earths crust

Answer 5

O

Question 6

Po is found as

Answer 6

decay product of Ur and thorium

Question 7

hydride with highest bp

Answer 7

h2o

Question 8

hydride w least bp

Answer 8

h2s

Question 9

only liquid hydride

Answer 9

h2o rest are gas

Question 10

B A trend among hydrides

Answer 10

decrease down the group

Question 11

B E trend among hydrides

Answer 11

decrease dtg

Question 12

acidity among hydride trend

Answer 12

increase dtg

Question 13

H2s pptys

Answer 13

colorless
poisonous
rotteen egg smell

Question 14

prep of h2s

Answer 14

kips reaction
hydrolysis of Al2S3
hydrolysis of thioacetamide

Question 15

prep of pure h2s

Answer 15

antimony + dil. HCl

Question 16

what is kips rxn

Answer 16

FeS + h2so4 = h2s + feso4

Question 17

bond ange between h2s-

Answer 17

92.5

Question 18

state of
SO2
seo2
teo2

Answer 18

SO2 - gas
seo2 - solids
teo2 - solids

Question 19

so3
seo3
teo3

Answer 19

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

Question 20

why seo2 and teo2 solids

Answer 20

polymeric solids

Question 21

are all bonds in so3 same

Answer 21

no
2- p ‘’ - d’’
1- p’‘-p’’

Question 22

how many forms of so3 solid and what are they

Answer 22

3 , alpha beta gama

Question 23

which two forms of so3 are interconvertible

Answer 23

alpha and beta

Question 24

which form is most stable and why

Answer 24

gama becs cyclic tetraer

Question 25

structure of seo3 | and teo3

Answer 25

seo3- cyclic tetramer | teo3- o attached to edge octahedral atoms

Question 26

stability of halides

Answer 26

decrease from f- i

Question 27

why is sf6 inert

Answer 27

its resistant to hydrolysis gasesous insulators

Question 28

all tetrahalides are

Answer 28

see saw shaped

Question 29

how is sf4 prepared

Answer 29

flurinating scl2 with naf in presence of MeCN

Question 30

best fluorinating agent

Answer 30

sf4

Question 31

uses of sf4

Answer 31

convert cooh- cf3 co- cf2 po- pf2

Question 32

which dihalide doesnt exist and why

Answer 32

Se becs thermodynamically unstable

Question 33

what is s2cl2 and structure

Answer 33

monohalide, non linear, dimer

Question 34

what is SE2cl2

Answer 34

dimer non linear monohalie

Question 35

uses of s2cl2

Answer 35

volacanisation of rubber

Question 36

o2 - para or di

Answer 36

para

Question 37

completely absorbed by

Answer 37

alkaline pyrogallol

Question 38

ppty of pyro gallol

Answer 38

biscuit colored solid

Question 39

prep of o2

Answer 39

``` 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 ```

Question 40

what happens when berthelot salt is heated

Answer 40

gives o2 | kclo3 is berthelot salt - oxygen rich

Question 41

pptys of o2

Answer 41

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

Question 42

uses of o2

Answer 42

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

Question 43

what are sub oxides

Answer 43

E ---E----O bond containing oxides

Question 44

polyxide

Answer 44

% of oxy is higher - peroxide or superoxide

Question 45

nature of transition metal oxides

Answer 45

acidic

Question 46

nature og na2o mgo

Answer 46

basic

Question 47

o3 pptys

Answer 47

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

Question 48

why is o3 thermodynamically unstable

Answer 48

it spontaneously decomposes to formm o2

Question 49

cautions of high conc o3

Answer 49

explosive

Question 50

inhalation of o3 causes

Answer 50

nausea dizziness

Question 51

soluble in

Answer 51

non polar liquid- turpentine cinnamon oil ccl4 | INSOLUBLE IN WATER

Question 52

is it denser than air

Answer 52

yes 1.67 times

Question 53

lab prep of o3

Answer 53

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

Question 54

reaction of o3

Answer 54

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}