Allotropic Forms of Sulphur Video Lecture - NEET

hello friends in this video on peacock
in my part 33 is brought to you by exam
fear calm no more fear from exam let's
understand the next important compound
of the group 16 that is sulfur we'll
talk about that form sulfur sulfur their
various arrow tropes there are lot of
minor probes actually self at the end in
fact 27 arrow troops but there are some
of the popular will study Alpha Beta
lambda there's 33 L of drops of
something okay
the alphas are a lot of sulfur is is my
lemon yellow lemon yellow and the shape
is my orthorhombic this is my then we
have be done this is my beta beta sulfur
this is again my bright yellow it is
bright and this is monoclinic the next
is lambda lambda sulfur so called
plasticity last example okay and this
beta server is monoclinic and it has a
prism like same also called prismatic
sulfur like so we will study these three
in fact Alpha is very stable very stable
at STP pita is not much stable lambda is
very unstable you see actually this
lambda will convert into alpha okay so
you talked about is alpha alpha this is
again lemon yellow in color
the melting point is almost 386 Kelvin
and the specific gravity spacing in
gravity his 2.06 this is the specificity
okay and this alpha alpha is formed by
evaporating solution of roll surfing in
CS 2 we'll see how the surprise
extracted this is a water insoluble this
is not soluble in water not water
soluble but less soluble in cs2 this is
highly soluble in CST
okay this is highly soluble in cs2 and
it is soluble in benzene or call also
the total is orthorhombic crystal system
this has this puckered s8c all the
sulfur one two five six structure of s8
sulfur attached in this ring it's a
crown shield shape ring crown shape
puckered ring as we can see okay so so
we are well now what do you see there's
so many yellow drops of sulfur so many
yellow tops okay see this has example s2
s3 s4 s5 s6 seven s8 like that s 22 - 20
we have there's so many retro some
supper okay we will study we have
studied actually three different
electrodes alpha beta lambda and this
alpha is again s8 in fact beta is also a
site okay so let's see the beta cell
first
Alvis other we have seen what is voluble
not soluble not what is holy converter
soluble carbon disulphide and the
melting point is 386 kelvin
let's see the beta server this would be
desert the melting point is little
higher there is 393 gether okay and
specific gravity is also little less
that is 1.9 it almost specific gravity
1.9 again the light yellow in color and
this is also soluble and ceased this is
Hollywood
ch2 how to prepare this beta cell this
is prepared from alpha server okay
you made this alpha cell per in a dish
and then cool it till you get the crust
and then you made up make a hole in this
crust and you take out the remaining
liquid and this colorless needle-like
shape structure which you get is my
Venus so it is form from alpha circling
okay so we have this alpha sulphur from
this actually you heat it or maybe 369
Kelvin or 96 degree Celsius Celsius you
need this in this temperature you get B
doesn't you hit this all the more
actually I'll show you you will get
lambda sub AB lots of support
okay alpha beta n lambda okay so how you
get beta sulphur you made this alpha
server
then you couidn't and you to make some
hole let's pour out the liquid you get
the screen down okay now if you see at
369 Kelvin or to say
96 degrees Celsius so at this
temperature you see all fire to beat
aggravation is taking place that means
at this temperature both alpha and beta
are stable okay so at 369 Kelvin or 1966
yes both alpha and beta cell for a
mistake okay
also note that both alpha and beta cell
para s8 with this puckered crown shape
structure okay you talk about s21 of the
retros this is again paramagnetic like
Oh - like Oh - this is also parameter
okay so if we heat this again to a
higher ten pressure to almost let
suppose 1000 Kelvin or 1000 degree
Celsius what you get is my s2 by atomic
sulphur in fact this is s2 beepers so at
very high temperature in fact the
lambdas circle also conversion to s2 the
ring breaks okay
this was my s2 is done and s8 is done
but also study s6 this is my s 6 1 2 3 4
5 6 6 helpers in a cyclic ring and
former chair structure this is s6
okay and this length is almost to zero
5.7 Pico meter and this angle is how
much a 102-degree it says 200 would
agree if you talk about this structure
this angle is 1:07 degree and this
length is any level in two servers to
zero for picometer
okay so these are the various error plus
or sulfur sulfur has so near ropes s2 s3
s4 s5 s6 I said s 20 me he studied s2 s
6 and s8 I said we have alpha beta in
lambdas are first confer heat Alfred 90
degree Celsius you've a PETA sulfur heat
winter surfer to one month three degree
Celsius you get lambda sulfur
you need further you get s2 vapors right
and they are per a minute talk about s6
they are again a cyclic sulfur and they
have shear like torture we'll take some
numerical of this which forms of sulfur
shows paramagnetic via will be just saw
that h2 sulphur shows paramagnetic be
even this has to suffer is that high
temperature it high temperature of
almost 1000 Kelvin you get sulfur papers
and they have two unpaired electrons in
90.5 Hospital just like my oxygen o2 and
they exhibit paramagnets
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