Preparation and Properties of Dioxygen Video Lecture - NEET

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let's understand some of the important
compounds of the oxygen family what is
the dioxygen self simple oxides of this
oxygen family Ozone's I will also
understand the eye drops or sulfur
sulfur dioxide oxfords or sulfur and
sulfuric acid so let's start first with
a dioxygen C dioxygen is nothing but my
OH - that is my dioxygen very very
important compound for survival of human
being without this we can't survive so
understanding the property of this how
do we prepare this dioxygen so there are
various ways in the lab if you want to
prepare what we do is we heat any oxygen
containing salt as I told no salt has
oxygen for example carbonate salt right
so salts have nitrate salt chlorate salt
so chloride salt carbonate salt my nitro
nitrate salt so these salts have oxygen
just heat one is the lab method I'll say
in the lab what we do is we heat my
oxygen containing sort this since the
salt had oxygen and oxygen containing
salt can we prorate might read permanent
carbonate it will give you oxygen for
example I take kclo3 I heat this I get k
CL + o do it easy nothing right in this
3 by 2 but as the reaction yes and you
heat this with some capital catalyst
that is the lab way
but we need oxygen more so we need some
other ways also okay so what we do is we
decompose the oxides so we become cause
my decompose oxides of the metal and
these metal has to be low in the
electrochemical series right for example
we have AG 200 we heat this we get
silver and oxygen all right suppose we
have a Jeep oh you read this you get
mercury an Austin you have TV 304 you
heat this you get PB o n you have PB o 2
also you heat this you get PB o n oxygen
okay
so just by a thermal decomposition of
oxide also of metal which low in the
electrochemical series for this visually
he'll design we gain oxygen we also
generate this oxygen by from our
hydrogen peroxide see this hydrogen
peroxide it can be readily decomposed
into water because that we have seen
that hydrogen peroxide actually is
unstable it can be easily decomposed
into water and oxygen action by the
catalyst such as my finely divided
metals platinum metals I think or and
magnesium dioxide you can actually
so it is manganese dioxide mno2 yeah
manganese dioxide you actually convert
us to go to to water and oxygen so this
is oxygen so this is all small-scale
actually so what about the large scale
in the large scale we want in the
industry so in large scale what we do is
we either do electrolysis of water we
have this water we do the electrolysis
of this and with hydrogen as my cathode
anode is positive so I know it is oxygen
and this is hydrogen so hydrogen as
cathode and oxygen is anode you do in a
crisis of water that is water or water
yeah what you get is oxygen we also in
oxygen from the air air has so much
oxygen we have seen almost winning 22
percent oxygen so from the air we get
oxygen by removing impurities from
oxygen to this carbon dioxide my water
vapors and whatever gas you get you do a
fractional distillation of this gas to
remove nitrogen also so oxygen generally
has nitrous air has oxygen nitrogen
carbon dioxide somewhat of a person so
you take the oxygen you remove carbon
dioxide you remove up first pretty easy
to remove right and now out of these
removing nitrogen and oxygen from the
air we use practitioner distillation so
removing water is pretty easy and just
use any other dehydrating agent it will
suck all the water you doing carbon
dioxide is also pretty easy can you see
you see oh it will remove all the carbon
dioxide your form chasm forward whatever
nitrogen
from that picture is a little tough to
use flash distillation
let's see some properties of dioxygen
the moment you think of oxygen you think
of pure colorless without any smell
order less gas and you're right
oxygen is my colorless it shows great
color but that is because to show some
color else you won't be able to see the
oxygen you don't see the oxygen why
because this is there's no color it is
colorless you won't feel the oxygen
because there is no smell it is
colorless order less yes it is soluble
in water and good through far this is
the aquatic animals see activating
animals plant or plants also survive in
water why because oxygen is soluble in
water because they also need oxygen an
oxygen is soluble in water and the
solubility is pretty good soluble in
what and soluble it is pretty good it is
three centimeter cube of oxygen in 100
centimeter cube of water almost three
percent pretty decent at my STP that is
sufficient to support my aquatic life
now this oxygen is gas in my STP but
actually it will liquefy at ninety eight
ninety can make it make it as liquid and
at 55 Kelvin you can freeze it and make
it a solid or these oxygen they are
three stabilizer those there are three
stable isotope wrong-o 16 or 17 and you
write on the left-hand side
116 117 hiding this oxygen is
paramagnetic we have seen this so when
we read about the molecular bond theory
and malice bond theory there we have
seen that oxygen is paramagnetic in fact
this is attracted by magnets you have
seen a picture also where there was a
liquid oxygen flowing in and they were
two magnets here
right this is not and this oxygen was
little tilted towards one on the pole so
oxygen is paramagnetic and we can
actually prove it using theories we have
discussed this oxygen tightly react with
almost all the metals almost all metals
so it directly react with almost all the
metals okay
and also nonmetals also accepting this
gold platinum they are exceptional and
some noble gas but apart from that way
sample FeO cuo calcium oxide carbon
dioxide they form oxide with almost all
the metals and nonmetals which these
nonmetal this is metal almost all the
metals non-metals a form oxide and this
reaction is exothermic right but nobody
actually does a big place also even
rusting of iron it takes place very
slowly if it is the exhaust have make it
should happen on its own immediately but
there's a catch why this reaction does
not happen on and so on giving this in
this reaction from metal or nonmetal
oxide this reaction is exothermic
but still the reaction doesn't happen
right so on
why because to initiate this reaction
external heating is required why because
the bond dissociation enthalpy
oxygen is very high almost 493 clusion
per moon so once this is overcome their
only the reaction will stop example I
have calcium plus oxy will give calcium
oxide or add ammonium plus oxygen will
give you 2 O 3 5 in phosphorus will
react with oxygen to form p4o10
carbon will react talking to form carbon
dioxide so this oxygen you need this
much energy to break this bond because
if this bond is not breaking broken how
this reaction will take place right
means methane will react with the oxygen
to form carbon dioxide water so thus you
need some energy to break this once a
very good question all the conversion
from metal or nonmetal to oxide is
exothermic still it doesn't happen on
its own it needs some energy body the
answer is pretty simple
yeah - for reaction to happen - the
oxygen double-bond should bring and
there's a hell lot of energy required to
break this double bond there is nothing
but 493 close in per kilo joule per mole
and thus we need some energy to initiate
this reaction okay let's see the uses of
oxygen rocket is used for respiration
that is very very much you breathe in
oxygen and you breathe out carbon
dioxide oxygen is in both the case for
burning oxygen is required oxygen is
must for burning without oxygen you
can't burn stuff this oxy acetylene
welding is for metals
oxygen is required and hospitals we need
oxygen for something patient they are
not able to be properly they are on the
oxygen if you want to fly at high
altitudes and high altitudes the oxygen
level is less and that sometimes you
tend to take a big container with oxygen
and
to use a mask even if you're climbing it
a high mountain let's do this is a high
mountain when you're climbing you're
climbing but there also you need this
kind of cylinders to breathe rock
mechanism you want to find the age of
the rocks that time also you need to
understand oxygen reactions because most
of the rocks is after she okay that's
six of numerical which of the following
does not react with oxygen correctly
Jing yes it reacts titanium yes platinum
know why Platinum is little of noble
metal iron yes obviously rusting of are
and we have seen so platinum is the only
one which does not react with oxygen
directly this is non reactive metal
Platinum and Gold you to complete this
reaction ch4 plus u CH c2h4 bond and
oxygen it will give you carbon dioxide
water all right we have seen most of the
hi to cover they want an oxygen to give
carbon dioxide and water we can balance
this reaction the next is aluminum plus
oxygen al plus oxygen relax al 2o3 this
is the okay thank you
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