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Question 1. What is meant by a pure
substance?
Question 2. List the points of differences
between homogeneous and
heterogeneous mixtures.
Question 1. Differentiate between homogeneous
and heterogeneous mixtures
with examples.
Question 2. How are sol solution and
suspension different from each
other?
Question 3. To make a saturated solution
36 g of sodium chloride is dissolved
in 100 g of water at 293 K.
Find its concentration at this
temperature.
Question 1. How will you separate a mixture
containing kerosene and petrol
(difference in their boiling points
is more than 25ºC) which are
miscible with each other?
Question 2. Name the technique to separate
(i) butter from curd
(ii) salt from sea-water
(iii) camphor from salt.
Question 3. What type of mixtures are
separated by the technique of
crystallisation?
Question 1. Classify the following as
chemical or physical changes:
• cutting of trees
• melting of butter in a pan
• rusting of almirah
• boiling of water to form steam
• passing of electric current
through water and the water
breaking down into hydrogen
and oxygen gases
• dissolving common salt in
water
• making a fruit salad with raw
fruits and
• burning of paper and wood.
Question 2. Try segregating the things
around you as pure substances
or mixtures.
NCERT Solutions Intext Questions Page no.
Question 1. Which separation techniques will you apply for the separation
of the following?
(a) Sodium chloride from its solution in water.
(b) Ammonium chloride from a mixture containing sodium
chloride and ammonium chloride.
(c) Small pieces of metal in the engine oil of a car.
(d) Different pigments from an extract of flower petals.
(e) Butter from curd.
(f) Oil from water.
(g) Tea leaves from tea.
(h) Iron pins from sand.
(i) Wheat grains from husk.
(j) Fine mud particles suspended in water.
Question 2. Write the steps you would use for making tea. Use the words
solution, solvent, solute, dissolve, soluble, insoluble, filtrate
and residue.
Question 3. Pragya tested the solubility of three different substances at
different temperatures and collected the data as given below
(results are given in the following table, as grams of substance
dissolved in 100 grams of water to form a saturated solution)
.
(a) What mass of potassium nitrate would be needed to
produce a saturated solution of potassium nitrate in
50 grams of water at 313 K?
(b) Pragya makes a saturated solution of potassium chloride
in water at 353 K and leaves the solution to cool at room
temperature. What would she observe as the solution
cools? Explain.
(c) Find the solubility of each salt at 293 K. Which salt has
the highest solubility at this temperature?
(d) What is the effect of change of temperature on the
solubility of a salt?
Question 4. Explain the following giving examples.
(a) saturated solution
(b) pure substance
(c) colloid
(d) suspension
Question 5. Classify each of the following as a homogeneous or
heterogeneous mixture.
soda water, wood, air, soil, vinegar, filtered tea.
Question 6. How would you confirm that a colourless liquid given to you is
pure water?
Question 7. Which of the following materials fall in the category of a “pure
substance”?
(a) Ice
(b) Milk
(c) Iron
(d) Hydrochloric acid
(e) Calcium oxide
(f) Mercury
(g) Brick
(h) Wood
(i) Air.
Question 8. Identify the solutions among the following mixtures.
(a) Soil
(b) Sea water
(c) Air
(d) Coal
(e) Soda water.
Question 9. Which of the following will show “Tyndall effect”?
(a) Salt solution
(b) Milk
(c) Copper sulphate solution
(d) Starch solution.
Question 10. Classify the following into elements, compounds and mixtures.
(a) Sodium
(b) Soil
(c) Sugar solution
(d) Silver
(e) Calcium carbonate
(f) Tin
(g) Silicon
(h) Coal
(i) Air
(j) Soap
(k) Methane
(l) Carbon dioxide
(m) Blood
Question 11. Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron filings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of a candle.
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