Name the three methods by which hydrous substances can be made anhydrous.
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Hydrous substances can be made anhydrous by:
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What is the composition of water ? In what volume its elements combine ?
Name the substances which give water:
(a) temporary hardness
(b) permanent hardness
What is the use of solubility of oxygen and carbon dioxide in water ?
Hot saturated solution of sodium nitrate forms crystals, as it cools. Why?