question_answer5)
Smoke
and fog both are aerosols. In what way are they different?
question_answer9)
Give
some examples of Tyndall effect observed in your surroundings?
question_answer18)
Write
two differences between suspension and colloidal solution.
question_answer23)
Define
sublimation. Name two solids that sublime on heating.
question_answer28)
Explain
why filter paper cannot be used to separate colloids.
question_answer31)
Identify
the solute and solvent in
(i)sugar solution (ii) soda water
question_answer50)
How
can we obtain different gases from air?
question_answer51)
What type of mixtures are
separated by the technique of crystallisation? [NCERT]
question_answer52)
Define saturated solution
giving example. [NCER]
question_answer53)
What are the two components of
a colloidal solution?
question_answer54)
What do you mean by unsaturated
solution?
question_answer56)
How would you confirm that a
colourless liquid given to you is pure water [NCERT]
question_answer59)
What is mass per cent of a
solution?
question_answer62)
What is meant by a substance?
question_answer63)
In what respect does a true
solution differ from a colloidal solution?
question_answer65)
Define crystallisation.
question_answer68)
Name two elements which exist
in liquid state at room temperature.
question_answer70)
Why is water called universal
solvent?
question_answer72)
Can you use filter paper to
separate colloids? Give reason.
question_answer73)
Is water an element or a
compound? Give reason in support of you statement.
question_answer76)
Define chromatography and give
its one application.
question_answer82)
Smoke and fog both are
aerosols. In what way are they different? [NCERT Exemplar]
question_answer85)
Describe any three properties
of colloid.
question_answer90)
What do you understand by the
term distillation? Give its one application.
question_answer92)
Give two points of differences
between an element and a compound.
question_answer99)
Differentiate between a true
solution and a colloid.
question_answer100)
Distinguish between metals and
non-metals.
question_answer101)
Distinguish between compounds
and mixtures.
question_answer102)
Distinguish between physical
change and chemical change.
question_answer105)
How do sol, solution and
suspension differ from each other? [NCERT]
question_answer111)
Explain why filter paper cannot
be used to separate colloids.
question_answer120) Write
dispersed phase and dispersed medium of emulsion.
question_answer121) How
many elements are known to us till today?
question_answer122) Give
two examples of suspension.
question_answer123) Why
particles in a true solution cannot be seen with naked eyes?
question_answer125) How
will you justify that rusting of iron is a chemical change?
question_answer126)
Give
one test to show that brass is a mixture and not a compound.
question_answer128)
How
many elements are naturally occurring?
question_answer130)
Which
type of solution is formed when milk and water is mixed uniformly?
question_answer131) Name
the process used to obtain pure copper sulphate from impure sample.
question_answer132) Write
one property of colloids.
question_answer133) Which
method is mostly used for the purification of solids?
question_answer134) Name
two metals which exist as liquids above 30°C.
question_answer139)
Why
silicon and germanium are metalloid?
question_answer140)
What
is fractionating column?
question_answer141) How
can you separate particles of colloidal solution? Name the process.
question_answer142) What
is meant by man-made elements?
question_answer143) Which
non-metal is liquid at room temperature?
question_answer144) Which
metal is liquid?
question_answer152) Tincture
of iodine has antiseptic properties. How it is prepared?
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(i) Explain why the milk sample was illuminated. Name the
phenomenon involved.
(ii) Same results were not observed with a salt solution.
Explain.
(iii) Can you suggest two more solutions which would show
the same effect as shown by the milk solution?
