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NCERT Exemplar Solutions Class 9 Science Solutions for Is Matter Around Us Pure ? - Exercise in Chapter 2 - Is Matter Around Us Pure ?
Question 1 Is Matter Around Us Pure ? - Exercise
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)
Answer:
The answer is b) (i) and (iii)
Video transcript
"hi
students welcome to lido
i hope your studies are going well and
awesome
today we are going to discuss a question
related to substance the pure
substance and the mixture so the
question is
which of the following statements are
true for pure substance
the first one says pure substance
contain only one kind of particles
yes the pure substance may be the
compounds
or mixtures no that is something wrong
question third pure substance have the
same composition
throughout yes that is also correct and
the last one
pure substance can be exemplified by all
elements
other than nickel no that is something
wrong
so the only correct options are first
and the third that is b so
b is the correct answer for this
now pure substance is something
pure substance
pure substance is something which
contains only one element
and same composition
and opposite of pure will be mixture
that is something mixture is two or more
two or more
two or more elements like
pure substance is something like a sugar
which contain all the particles are of
sugar only
there's nothing mixed with it wheat
flour
salt the taste all the composition will
remain same
whereas the mixture is like a veil
the vegetables or the subji
that we make it at home vegetables the
fruit salad
they are mixture more two things are
included in it
and the taste will also vary whereas the
pure substance the taste will remain
same the composition is going to remain
the same
because all of them have the single
element so the pure substance and
mixture these are the two
opposite of each other we can see the
correct option for the question is
option b
that is first and the third statement
are correct
the second and the fourth statement are
something wrong
i hope you understood the meaning of the
pure substance as well as about the
mixture
i try to find out the more examples of
the pure substance
and also the mixture and try to apply
this property
do you find the same composition in the
your substance as well
all they are of same particle you will
get to know the answer through the
practical experiment as well
for any question please drop in the
comment section
for more updates please subscribe to the
leader channel as well
thank you"
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