MEDIUM
9th Punjab Board
IMPORTANT
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Which separation technique will you apply for the separation of butter from curd? (Centrifugation/ Filtration)

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Important Questions on Is Matter Around Us Pure?

MEDIUM
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 1
Which separation technique will you apply for the separation of oil from water? (Separating funnel / Distillation)
MEDIUM
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 1
Which separation technique will you apply for the separation of tea leaves from tea?
MEDIUM
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 1
Which separation technique will you apply for the separation of iron pins from sand?
EASY
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 1
Which separation technique will you apply for the separation of wheat grains from husk?
MEDIUM
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 1
Which separation techniques will you apply for the separation of fine mud particles suspended in water?
HARD
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 2
Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
HARD
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 3

Pragya tested the solubility of four 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).

Substance Dissolved Temperature in K        
  283 293 313 333 353
Potassium nitrate 21 32 62 106 167
Sodium chloride 36 36 36 37 37
Potassium chloride 35 35 40 46 54
Ammonium chloride 24 37 41 55 66

(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?
EASY
9th Punjab Board
IMPORTANT
Science>Chapter 2 - Is Matter Around Us Pure?>Exercises>Q 4
Explain saturated solution with examples.