Preparation and Properties of Ozone Video Lecture - NEET

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exam the next is ozone o3 low income
this is again electronic form for oxygen
ozone ozone layer you must have heard
ozone layer which protects us from the
ultraviolet rays this is our mother
earth the Sun let's oppose him so this
one has the UV rays so this alone
reflects all the UV rays and only the
normal rays comes the earth and we are
protected okay so this is a three in
this formula was determined in 1865 and
this okay is diamagnetic okay this is
mine ozone and this is again a pale blue
gas with a pungent smell pungent smell
pungent smell very bad smoother and this
is actually created at the height of 20
kilometer from here 20 kilometer if you
go up you will get this ozone and it is
actually is formed by the atmospheric
oxygen in the presence of sunlight
sunlight at a higher origin maybe 20
clover tremor and this ozone layer forms
a layer and this protects the Earth from
excess concentration of UV rays they're
very powerful addition okay
so let's see how to prepare this ozone
well before this let's see some more
facts about those zones
so this 1865 the formula was arrived at
1864 1840 and 1840 this ozone was
recognized for us by Christian Frederick
was first recognized in 1840 and this
word came
posing from the world Rosine very
quadrazine
and this will smell because it has a
very bad smell and thus the name was
only came from this what was in liquid
okay let's see the preparation of ozone
so you can prepare this by if you have a
dry stream of oxygen you pass it through
silent electric discharge then you will
get both it it has to be a silent
electric discharge okay and the Delta H
for this reaction is plus 142 kilo Joule
per mole that is this endothermic you
need some energy and this energy
supplying by silent electric pressure
shoe okay let's see the properties of
this alone this is again a peel blue
liquid P blue gas acting feel blue gas
in the liquid form it is a very dark
blue liquid liquid in the lower
temperature high pressure when it has
made solid again higher pressure and
lower temperature it becomes a dark
black soil because they told the state
for a given substance dependable
temperature so at STP is gas lower
temperature is liquid all the world
intuitive which we can solve defy the
color change it has very bad smell
characteristics very bad smell and the
others what ozone capable Greek word
that means Athenian it is smell and this
smells like chlorine it is harmful if it
is taken in the concentration more than
100 part per million so if it is taken
in higher concentration than this it is
harmful
but if ozone is not there then also it
is harmful then all your UV rays will
kill you
from the Sun so you need your zone but
in the small quantity right so if it is
if the amount of ozone exceeds more than
100 parts per million and breathing
becomes uncomfortable if nausea and
headache so also is required but only in
the small quantity so if you compare the
stability of ozone and normal oxygen
ozone is little unstable
thermodynamically ozone is unstable as
if with respect to oxygen it easily
breaks in to oxygen and liberate my I
mean it is a break into oxygen liberates
heat if you see oxygen will easily ozone
easily break into oxygen and give this
or I can say hot or to cross over so
this actually your zone says it breaks
into what do I know it is a very strong
oxidizing agent because it limits of
fear okay and this is an exothermic
process then you see our Delta G is what
Delta H minus T Delta s so here as I
told Delta H is negative why does it oh
it is exothermic process it liberates it
right and Delta s is positive why
because the in token system is
increasing from 1 to 2 so Delta G is
highly negative is highly negative thus
if you take high concentration of this
it can be explosive
well Delta G is highly negative reaction
is highly favorable and thus high
concentration of ozone can be dangerous
it can be explosive they told it is a
strong oxidizing agent you can see this
I have let suppose PVS react with ozone
inform pbso4 and what in fact I - when
reacts with goes on with somewhat
molecule form which - I do it see
in fact this method is used to estimate
ozone gas because ozone gas you need
some method to estimate it Hey
so excess potassium iodide solution when
ozone will react and that excess
potassium iodide solution is buffered
with purity
my iodine gas is limited and this iodine
gas can easily titrate with any standard
solution example sodium thiosulfate and
this method is actually used to estimate
one gas right so those on gas react with
excess potassium iodide in it was ki
this is Koh here and then you get iodine
gas and this iodine gas is again our
titrated with the standard solution of
sodium thiosulfate okay the hot topic
about ozone which we have straight so
many time is the ozone layer depletion
so many times we have studied this ozone
layer depletion and jelly freons
are the one which are used in
refrigerators and the eurozone spray
they are harmful and they are the cause
of the ozone layer depletion in fact
nitric oxide oxide is also one big
source or ozone layer depletion this
nitric oxide and react with ozone to
form no.2 no.2 so this is responsible
ninety oxide is also responsible for
depletion of ozone and these nitric
oxide actually you get from jet planes
the liber8 nitric oxide these nitric
oxide react with ozone to form nitrogen
dioxide and oxygen the ozone layer is
depleted another source for depletion of
ozone layers are crayons
these freons the big threat this is
using the aerosol spray in refrigerants
these also react with ozone to form
oxygen okay so if you talked about the
property or the structure a stronger
structure of ozone so ozone structure is
something like this three oxygen and
this bond length is 128 because it the
resonance actually you can draw on one
structure this is a single bond this is
a double one okay double one will have
these two lone pairs there are six long
pairs same thing here this is the
structure and this angle is almost 1:1
seven degree so the his wife ozone
properties of ozone take it in less
quantity good but taking in more
quantity is problem you can get headache
nausea it has matte smell paint blue
glass or dark blue liquid on dark glass
solid properties of physical properties
of ozone in high concentration with the
exclusive and reacts and then we have a
huge threat of ozone layer depletion
from nitric oxide and crayons and this
is the structure of let's see some of
the uses of ozone one is the journey
site it is used for jovi signs and
disinfectant disinfectant also we use
ozone we use to sterilize water
sterilized water this is my water
this is also used as a as oxidising
isn't in the manufacture of potassium
per finger we use this as oxidizing
agent it's also using the bleaching oil
and the ivory as floor and stuff so
means this is often was the main one is
that it protects us from the harmful UV
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