Question

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.

  • is matter around us pure CBSE Class 9
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Answer

(a), (c), (d), (e) and (f) are pure substances.

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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).
Substance dissolved Temperature in K
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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

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