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Chapter 2 NCERT Class 9 Science SOLUTIONS

6. How would you confirm that a colourless liquid given to you is pure water ?
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Question:

How would you confirm that a colourless liquid given to you is pure water ?

Answer:

Pure water boils at 100°C (373K) at atmospheric pressure and salt water boils above 100°C temperature. If the liquid boils at 100°C at atmospheric temperature then it is a pure water otherwise it is impure.

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10 gram sodium nitrate is dissolved in 35 gram saturated solution of sodium nitrate at 25°C temperature. Calculate solubility of sodium nitrate.

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Classify the following into elements, compounds and mixtures.

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Identify the solution among the following mixtures. (a) Soil (b) Sea Water (c) Air (d) Coal (e) Soda

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Which of the following things are pure substances? (a) Ice, (b) Milk, (C) Iron, (d) Hydrochloric Acid, (e) Calcium oxide, (f) Mercury, (g) Brick, (h) Wood, (i) Air.

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Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar, filtered tea and ice.

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Pragya tested the solubility of three different substances at different temperatures and collected the data as given below.

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Write the steps you would use for making tea. Use the words solution, solvent, solute dissolve, soluble, insoluble filterate and residue.

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Try segregating the things around you as pure substances or mixture.

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Classify the following as chemical are physical changes.

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To make a saturated solution 36g of sodium chloride is dissolved in 100 g of water at 293K. Kind its concentration at this temperature.

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How are solution and suspension are different from each other ?

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List the Points of differences between homogeneous and heterogeneous mixtures. OR Differentiate between homogeneous and heterogeneous mixtures with examples

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What is meant by substances ?

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