"L18 : Question & recap - Metal & Non Metals Video Lecture - Class 10

hello friends this video on metal and
nonmetal part 18 is brought to you by
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before watching this video please make
sure that you have watched part 1 to
part 17 so the question says the
metallic oxide of Jing Magnus is copper
i heated in the following the following
metals which on this will have a
displacement reaction so we know that
Magnus is stronger than Jing is stronger
than this you know because we have - you
can comment on this CD zero right so
Jane will not react with zinc zinc oxide
manganese oxide will not react with nine
is copper oxide will not react with
copper this we can likely cut right now
when I talk about zinc will jink react
with Jing displace Manny's oxide no way
why because zinc is weaker - oxide bill
Jing displays copper yes so it will
displace copper from corporal site
magnesium will magnesium displays zinc
oxide yes it can right because magnesium
is stronger than golfer will magnesium
displays copper yes Maggie shaped a
mystical machine is strong and copper
will copper displacing copper is weaker
than zinc no will copper displace
magnesium no so this is my solution
very simple you just need no reactivity
order wish metal do not corrode easy
answer is gold gold doesn't corrode you
know that very less reactive which of
the following pair will give you
displacement reactions I have NaCl
solution and copper metal so in this
case if you see my copper is more
reactive in silver we know that so cop
copper will displace silver from this
this is true silver is less reactive
than and so it won't do Elmo neom is
less safe in management replace copper
is less reactance on sodium it one
depress so in this case the only
solution is this guy why because copper
is more reactive than silver
okay let's take another question an
element to react his oxygen to give a
compound which is a high melting point
this compound is insoluble in water the
element is likely to be calcium carbon
silicon I so we know that so in this
case the answer has to be calcium
because calcium and react with oxygen to
form a compound which is high melting
point iron is it gives rust silicon
carbon or no much calcium is the one
that is food cans are coated with tin
not zinc
why because you have they given four
options zinc is costly than tin zinc has
a higher melting point in zinc is more
reactive than tin and zinc initially the
answers obviously zinc is more reactive
than 10 that's why it is go ahead with
tin not Jing right so this is the answer
why since then is less reactive or jink
is more reactive so it is quite with tin
not Jing correct since Jing is more
reactive it is not coated with zinc tin
is less reactive it is coated with a
chain
you are given a hammer a bulb battery
wire and switch how will you use them
distinguish between the samples of
metals and nonmetals so if you see here
with Hammer hammer
we can use this ductility malleability
property right we get this beaded so
we'll beat that particular sample right
if it is malleable I can say that it is
metal that is one thing the second thing
one wired switch with this I can check
for electrical conductivity so I have
some metal like this I can put this
metal like this I will put a battery
right I'll put a bulb
this wire is there is a switch right so
with this I can check whether this
particular metal or this current
particular sample the conduct or not so
if it glows that means it is a metal so
it will metal a good connector of XD so
with this two property male ability and
electrical connectivity I again tell
whether the sample is metal or not
correct because the first hammer I'll
use formal ability and battery bulb wire
and such as used for electrical
conductor correct what are empathetic
oxides give two example of ampatrick
oxides amphoteric
oxides are oxide which are both acid and
acidic and basic right example al 2 O 3
is 1 and zinc oxides one they all
amphoteric oxide because they are both
acidic and basic name two metals which
will displace hydrogen from digressing
and two which will not so you can see
the reactive metals like sodium
potassium they will displace hydrogen
from dune this place hydrogen from hg
and weak matters visa american sea is a
gold copper right silver this will not
displace this will launch this place
right so my strong metals will displace
and Pete metals will not displace
correct the next question see is that in
an electrolytic refining of a metal what
would you take is anode cathode and
electrolyte so we know that a node we
generally take as in pure substance we
take cathode as thin strip of pure metal
here then for the case of copper
actually assume that and my electrolyte
solution is nothing but my metal
solution example in case of copper I
will take copper sulphide right so white
like this because in case of cathode if
you see
cathode will give a this is cathode
which gives a negative charge oils and a
positive charge capital Giro of
electrons and with this electrons -
opposed copper is my link copper sulfate
from copper ions from copper sulphate
with dissolve there and this guy will
give a positive charge so which will
help in dissolving copper from this
impure copper to copper sulphate
solution that's why we use a cathode for
in cathode we use a thin strip of pure
metal and anode we use impure metal and
this solution uses metal solution
correctly the question is what type of
oxides are form and nonmetals combined
with oxygen listo as nonmetal so
generally we ferry b8 either acidic or
neutral so if you have let's suppose
sulfur you add this you get so2 this
acidic if carbon you add with this
oxygen you get co2 so this guy is
neutral and this race is it right so
either get a stick or neutral oxides
when you combine nonmetal with oxygen
you have to give reason first platinum
gold and silver is used for making
jewelry so for this the reason is for
this I will give the reason as I will
say they are less reactive
Gold because they are less reactive it
can use for jewelry they are corrosion
free you don't corrode they are middle
so we can make a jewelry and they have
shine since they have shine they're used
to make jewelry all this is like me
potassium lithium and sodium Stewart and
royal they are very reactive
they are very reactive and the moment it
comes to moist the resume h2 in water or
air it reacts so that is captain oil air
Maryam is highly active metal yet as you
used for cooking utensils that is
because we know that L money M forms
oxide al2o3 write a memo sign and this
guy is nonreactive
this guy is nonreactive it is resistant
to corrosion
this is nonreactive I am talking about
ever New York side and L mone message is
lightweight right it is cheap also it is
not very costly and it is good conductor
that is most important thing because
when you are making a utensil it has to
be good current rough heat have to
forgive so Elmo name is good current
drop he the next question is you must
have seen the tarnished copper vessels
cleaned with lemons or tamarind juice
why why are the source of cents used for
seeing the vessels I know the source of
sins are acidic in nature right so if
you see this guy lemon lemon has citric
acid so if you see this copper copper
actually the matter
reacts with carbon it gets Cu co3 like
me we eat copper mom in use copper a lot
this becomes C OC 3 this is green color
right this green layer to remove this
what we use this useless this guy is a
basic right so with this base I use acid
that is any of this lemon or tamron to
neutralize this effect and remove this
Cu theory it dissolves this layer this
layer this layer is this is the layer
and this layer is dissolved the dumb
acid alright the CU chi 3 is a basically
a and dissolve them a man went to a
door-to-door posing a goldsmith he
promised to bring back the glitter of
the gold of the old of ornaments a lady
gave the old bangles in depth in the
particular solution the bangles pucker
like a new
but it but the weight reduced
drastically lady was upset but before
the agreement before the argument this
guy ran away so you want to know what
was the solution we know this this is a
easy one this was a Croatia this is 3 is
to 1 we have SC ln hno3 nitric acid
concentrated we have concentrated HCl
nitric acid come into h2 one in fresh
prepared fresh prepared and there is a
Croatia and gold resolved in this gold
doesn't dissolve in HCl whole result
does not dissolve nitric acid but in
this aqua regia
if the salt so that particular solution
is aqua ratio gabe reason why popper is
used to make hot water tanks not steal I
mean they don't use iron to make hot
water tank you see the geezers which you
have in homes the hot water users their
copper is use and as not ascribe because
if you see copper and if you see water
if you passed heat also if you make it
warm also there is no reaction there is
no reaction right but if you take iron
but when you take iron if you see RN and
you react with water you get Fe 3 o 4
plus h2 right so I mean each balances
this becomes there's this and you need
heat you see atom reacts to hot put
copper does not react with forward and
that's why copper is used for making hot
water tanks not the let's do a recap of
what we have lamp elements can be
classified as metals and nonmetals right
you have metals and non metals metals
are lustrous malleable ductile good
current drop need electricity
they are solids except mercury mark
bettors they lose electrons non metals
metals combine with oxygen to form
basic oxide sample aluminum oxide zinc
oxide our example of oxides which show
both acidic and basic and there
I am putting outside the exceptions
actually right and then different metals
react with water and is in a different
form and that's because the different
reactivities they have and the list of
common metals can be arranged in their
order of reactivity that's known as
Activity series we have done that using
experiments our metals ever hydrogen
activity series can displace hydrogen
from dilute acid so in the accuracies
their hydrogen also so metals above
hydrogen can displace hydrogen from the
acids are more reactive metal will
displace a less reactive metal from the
salt solution metal occur is a free
element or in the form of compound also
in the nature the extraction of the
metal from the ore in the defining the
whole thing is called metallurgy is a
very old process people have been doing
this since long and i alloy is nothing
but the homogenous mixture of two or
more metals or metal or non metals it
has different properties the surface of
some metal that this ion is correlated
when they are exposed to moist air for a
long time and this phenomenon is called
corrosion nonmetals have the property
exactly opposite of metals they are
neither maryville non ductile they are
very intrusive e-except graphite which
is good character and thank you visit
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