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Selina Solutions Class 9 Biology Solutions for Exercise in Chapter 6 - Seeds: Structure And Germination
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In experiment No.5 we are using mercury in the test-tube and the beaker. Why can’t we use water instead?
Answer:
Mercury is used instead of water because of the following properties of mercury, namely:
Mercury is a good conductor of heat and is the only metal that occurs in liquid state
It sticks to the capillary walls and provides accurate results
They can easily be obtained in its pure state
It has a low specific heat.
Video transcript
"hello everyone welcome to little this is
priya
here we have an interesting question let
us look into the question now
in experiment number five we are using
in the test tube
and in the beaker why can't we use
mercury so in the test tube vrt we are
using mercury
instead of water in the test tube as
well as in beaker
and these are the reasons why we are
using
the mercury in the test human beaker
the first reason is mercury is a good
conductor
so mercury is a good conductor
of heat
make it is a good conductor of heat so
that we are using
mercury instead of water so being it is
a good connector
of heat and it is the only metal that
can occurs in
liquid state and the second
reason is it sticks to the
capillary walls and provides accurate
results
mercury can stick
stick to them
stick to the walls of
once off test tube
it sticks to the walls of the test tubes
and use them
gives you accurate result and the third
reason
they can easily be obtained in a pure
state
mercury can be it can be
easily
obtain
a
few state
and the fourth reason is it
has a low
specific
heat that means it requires very less
temperature
to get heated so these are the four
reasons why we are using mercury instead
of water the first reason is mercury is
a good conductor
and the second reason is it sticks to
the walls of test tube and gives
accurate
results and third reason is it can be
easily obtained in a
pure state and the sec and the fourth
reason is
it has a low specific rate
hope you understand this video if you
like my video please subscribe to our
little channel
and if you have any doubts you can keep
a message in comment box thank you"
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