Formation of Coloured Ions Video Lecture - NEET

hello friends this video on DNA flock
par 23 is brought you by exam feel calm
no more fear from exam talk about very
important concept of transition metal
discolor 9 before that let's understand
some of the basic concept see the
colored spectrum rain is 400 to 750
nanometer so if a light has this range
400 to 750 nanometer 400 to 750
nanometer then you can actually see that
the wavelength is in this range 400 to
70 then only you will be able to see
that particular object else you'll not
be able to see so many rays in front
nearby for example the Rays for the
radio is mobile phones they are in a
different range and those you cannot see
them you see the Rays only when it is in
the range of 400 to 750 now okay so with
this we also the line spectra concept
that if there is Adam and this you put
some light right the electron goes to a
high excited state and come back when it
comes back it emits light or when it
goes to higher excited state also this
electrons emits light because it emits
the Rays of this range 400 to 750
nanometers sometimes and thus you see
the Mayan spectrum is the my spectra is
nothing but spectrum of radiation
emitted by substance that has absorbed
energy
it's called emission spectrum we have
learned a lot about this if you want to
know more about this you can watch my
video atoms where we explain this in
more better way right same thing just
know what I have told example hydrogen
you this is electron it it takes up
energy it jumps to a higher orbital
again it gives back energy and just back
the lower orbitals so this happen
happens in hydrogen in fact it happens
in all the atoms and thus this light if
the lambda for this is in the visible
range for for it to cell 15
you will actually see color right same
thing is happening in transition metals
same thing is happening in transition
metal exactly in transition metals what
happens is the D orbital you see the D
orbitals just now we have seen has again
five sub shells and they are different
energy levels these three are the lower
energy these three are the lower energy
and these three is two is higher energy
dependency the mass this is 2 by 5 n
which is 3 by 5 I think yeah all the way
around this is 3 by 5 and this is to my
right this has the higher energy this is
the energy now if my D orbital electrons
are unpaired for example I have only two
electrons here these two electrons keep
jumping from these to this now since the
jump and there is a difference in the
energy when we come back or when they
jump they either absorb light or when
they come back the emit light so this
light or this ray is in the visible
spectrum 400 to 750 nanometer so this is
in this 400 to 750 nanometer right they
take some energy they take energy in
this scene actually sometimes and they
go to higher state since they take some
energy from the sunlight or any light
that particular energy is absorbed and
the remaining is translated back to the
human and we can see with our eye that
color okay and that is the reason T any
substance which for example leaves a
pure green why because leaves they
absorb all the light of sunlight
exocrine so they absorb all the light
and they just reflect back green and we
can see that green color same thing here
they absorbed from the sunlight if you
absorb some some component the reflected
light will change the color will change
and that's why I will see that this D
block elements have different colors but
understand that this why I'm talking
about the slide this is the critical
slide the orbital actually is divided
into two part dxdyd that has the lower
energy level and DX square minus y
square and DZ square is higher energy so
electron keep jumping if
they are unpaired electron only they are
unpaired electron
they have colors this is the exam this
is how our D orbital looked so the D X D
these three actually has lower energy
these three has lower energy and these
two has higher energy so electron jumps
from these to these or these to these
and that it imparts it imparts color and
this happens only when there is an
unfading talked about that this
understand that D orbitals have
different energy okay so if you see the
D block elements they have colors their
ions have colors and why they are
colored in fact their garden butin
solids and aqueous solution you see gold
color these are all ions of transition
metals and they are colored and they are
colored because of unpaired electron I
just showed you unpaired electron there
is unpaired electron this D they'll move
from lower to hi orbitals in the D okay
so there is a DD transition from from
this D to this D since there is a
difference in energy there is a DD
transition and this is this transition
happens only if there is an unpaired
electron so unpaired electron is the key
for the color like if you see unpaired
electron is key for all of things
unpaired electron is the key for minor
the character unpaired electron is the
key for color also okay so it is a D
orbital unpaired electron and the DD
transition because of that you get C
colors in this ions okay so compound of
transition metal appears colored when
there is a frequency of definite energy
absorbed well I showed you this formula
Delta is going to H nu so if frequency
if the energy that is absorbed as the
wavelength of 400 to 750 nanometer that
means the sunlight is absorbed the
deflected light will not have a
component sunlight and it will give that
and this energy is actually required for
DD transition this the entire energy
Delta e required for movement from lower
D ability to hide your belief that takes
the energy and that energy in the light
visible range that is 5/4 into 750
nanometer you see color okay so if you
see titanium +4 at this colorless
titanium class 3 is copper in color same
thing valium plus 4 is blue banding plus
3 is green men in class 2 wallet so
different chromium class 3 is violet
corneum plus 2 is blue okay manganese
plus 3 is violet - plus 2 is me iron
plus 3 is yellow one plus two is rings
they are different colors so actually
this color is nothing but the color
which is not absorbed okay this is the
complementary color for example if the
color absorbed is violet the color
absorb color absorbed is violet the
color observe will be alone so in this
case my violet was a colored absorbed
okay for orange the color absorbed is
blue for green for green anything green
yeah the color absorbed is red okay for
yellow the color absorbed is wallet and
for violate the color of opposite
because yellow and holiday are in
complementary green and red they are
complementary right there is a red the
color absorbed is green the whole iron
looks green the color has opposite okay
the complementary color actually you see
okay so let me reiterate once again when
the electron from the lower D energy we
have lower the energy moves to a X or
excited to a higher energy then the
energy of excitation is nothing but it
corresponds to the frequency of light
absorb okay
the frequency of this slide generally
lies in the visible range that is 400 to
750 none
450 to 500 to 750 now okay
thus it absorbs color and the
corresponding complimentary color a
specific example the boiled is absorbed
you see yellow the red is absorbed you
see three okay now a frequency of the
length frequency of the length the light
absorb depends on the legends also the
legends attached it depends on that also
okay for example the active solution my
water molecules are legend okay what our
legend let me repeat I think if you
don't know if you don't know that I can
say that legends are nothing but
molecules or ions that bind to the
central matter metals to form the
coordination complex okay so example if
I have a PT and in this I have fluorines
attached these will be religions will
talk about it we need not put the
complex science so it depends on the
charge and also depends on the ligands
thank you visit exam viacom to watch
more reviews at M free online test get
three study materials find tutors and
mentors and much more trying sense again