Hydrogen (Part - 11) - Hydride Gap, Chemistry, Class 11 Video Lecture

hello friends this video hydrogen part
11 is brought to you by exam fear calm
no more fear from exam so what is
hydride gap so if you see these ropes
forms hide right right the group one
group and I told that these two thousand
form hydrangeas forms metallic
headlights these forms covalent and
these I don't forms interstitial but out
of these group seven eight and nine
these three groups they don't form
hydrides so if you see there is a gap
these forms don't fight right they don't
form I tried so there is a gap actually
to be these forms nitrides these forms I
tried these forms I tried these forms I
tried all those fine all the metals
non-metals these also would form right
right they are noble gas but that is not
in continuity but if you see from here
to here if you go from here to here high
dry it's faded they are forming on
planes suddenly we found three group
they don't want for my drains again they
reformed those for me coverage there's a
gap here right group seven eight nine
block of D block they don't form our
rates and this is a gap and this gap is
called height right there he is known
group seven eight nine don't form right
right and that's why there's a
discontinuity apart from that you start
from here Group 1 group seventy all of
these form matrix this is a gap and we
call it hide right there let's take some
examples do you expect the carbon
hydrates of C in HTML us to form input n
is equal to 1 you get ch4 right so if
you see ch4 it is electron deficient no
electron Nexus no it is electron precise
the question is do we expect the carbon
hydrogen of this form make as Levis acid
or base since and since it is electron
precise it won't act as as nervous
why because it is electron precise
correct it won't that next thing on the
example what do you understand by the
term norm choco metric hi friends do you
explain this type of hydrides to your
home by alkali metals no see non-strict
metric is something I have X H and you
have some fractional number for example
1.2 or X H 1 point 9 or X H 2 point 7
something like that so these kind of
hydrates you get when you have some
metals and that act as sponge right and
they are not a transition metals
actually transition metals at a sponge
and in the sponge has four and in his
four hydrogen sets since hydrogen can
sit more or less than so there is no
reaction assets between hydrogen and
transition metals there is no reaction
as such there is no pure reaction just
that transition metals have some holes
and had to be sits here and in this
whole example more hydrogen gets hit
less nitrogen say depending on the
temperature and pressure so this value
is not constant this may be fashionable
this may be real number you do not know
I in this value may change also so they
are called nonstick metal because there
is not proportional when we talk about
alkali metals for example sodium when it
reacts with hydrogen sodium as one extra
electron hydrogen has one division so
one electron will get transfer it will
become na + NH miles there is a complete
transfer of electron light from sodium
to hydrogen so there is no question of a
few electrons or more electrons always
one complete transfer click on right so
it is never Naz choke him it open the
stand right because in this hydrogen
reaction Saudi message so in this case
for example I have some foundation with
legs and I add it 100 transmit legs and
only it suppose
120 hydrogen atoms are filled in this
gas when you heat it let's suppose 10
items are gone now I have a 110 hydrogen
atoms windows so if you write
instruction to recover X H 1.2 here to
become X H 1
one correct because I have it suppose 10
100 atoms of X in a particular small
block of X transition metals and I have
the holes in the holes I have filled 120
hydrogen atoms so the phone line become
X H 1.2 there is no reaction at rates
all just fitting in the hydrogen just
going and sitting inside this booze and
the next one if you just heat this 10
hydrogen is gone just evaporated it just
went out and you have only want in
hydrogen so in this case the formula
without excess 1.1 so you see this is a
difference there is no reaction is just
hydrogen sitting in inside there and the
number of hydrogen that sits inside can
vary so the number can also vary and
they can also be fraction because there
is no reaction going on here all right
let's take one more example what do we
expect how do you expect the metalic
hydrides to be useful for hydrogen
storage so they told the metalic
hydrants are like sponge it can take
hydrogen's in this right so hydrogen is
absorbs if you see the hydrogen is
absorbed as hydrogen atoms because
hydrogen atoms are very small in size
right so you do more expand more
hydrogen hydrogen inside this this thing
the whole thing expands little bit
because you're pumping more than one
hydrogen what happens is in the day it
expands little bit right and becomes
little stable unstable so if you heat
this if you hate this what'll happen is
the string and it will iterate hydrogen
yes because the moment hydrogen ions
comes in forms hydrogen gas and gives
energy also hey so as hydrogen atom is
stored here the moment you store more it
expands but the more you heat you little
bit it just the whole thing strings and
hydrogen gas comes out and this gas is
used as cube correct so thus thus
transition bitters
great transition metals or their alloy
can be used for hydrogen storage because
we are talking what the metalic hydrides
so if you see in this the question asked
how does the atomic hydrogen off seen
hydrogen torch is used for cutting
inventing purpose so if you see what
happens is hydrogen the moment you pass
electric
hi electricity it breaks into H atoms in
the molecule but and there is a heat
required for this the area required for
this now it has a very short life span
the moment that extra force is gone it
again combines proforms immediately 0.3
seconds very short lifetime and when it
combines to form hydrogen molecule right
it gives so diligent
it gives already the H is negative it is
very high in a lot of heat this lava
field right and this is used for cutting
invading because this can mend this can
bend are the question is among n is 3 H
2 O and HF which has the highest
magnitude of H F 1 so I know that HF
bond depends on two things atomic size
and electronically and I do that less
atomic size and more electronegativity
favors high one let me write that less
atomic size and high electro negativity
favors favors h mo
correct correct
so lesson is the atomic size higher is
the electronegativity the more is the h1
so let's in this case you see we want to
find the least atomic size vation has
the least a living size going you
compare fluorine oxygen and nitrogen
nitrogen oxygen fluorine fluorine has
the least size we talked about
electronegativity chlorine again has the
highest max electronegativity so in both
case two rainiest favorite so we will
say that H has highest how did you know
correct why because how did you model
favor with the small atomic size and
high in a creativity and in both case
for in comes out to be say given the
cushion is saline hydrides a know to
react with water to produce fire can co2
be used here for five extinction so what
a certain height right sellin hydrides
are my NH CH bonds ionic hydrides so
these are misaligned ionic hydrides so
let's in a reaction we need have any
edge when you react with water this
forms sodium hydroxide and hydrogen gas
similarly we have ch2 when it reacts
with water is always to calcium
hydroxide and hydrogen gas now what
happens if you add carbon dioxide let's
take an H this reaction let's add carbon
dioxide so what will happen carbon
dioxide will reduce will you get reduced
by metal hydride it will become at sea
there will be reaction between the hip
is also so co2 will not use C whatever
co d you're using that we consume here
only when we
useful to stop the fires in this case
because we know for why extinction we
know generally you co2 or we use water
or sand in this case we can't use water
because it react to the water because
you co2 because we are doing co2 you can
have to use sand thank you visit exam
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