Chemistry
Normally, solubility of a crystalline solid increases with temperature. Does it increase uniformly in all cases ? Name a substance whose solubility :
(a) increases rapidly with temperature.
(b) increases gradually with temperature.
(c) increases slightly with temperature.
(d) initially increases then decreases with rise in temperature.
Water
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Answer
No, solubility of a crystalline solid does not increase with temperature in all cases.
(a) Solubility increases rapidly with temperature — Potassium nitrate
(b) Solubility increases gradually with temperature — Potassium chloride
(c) Solubility increases slightly with temperature — Sodium chloride
(d) Solubility initially increases then decreases with rise in temperature — Calcium sulphate
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(b) a solution is always clear and transparent.
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(d) the solute cannot be separated from a solution by filtration.
(e) fused CaCl2 or conc. H2SO4 is used in a desiccator.
(f) effervescence is seen on opening a bottle of soda water.
(g) Table salt becomes sticky on exposure to humid air during the rainy season.
What are drying or desiccating agents. Give examples.
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(a) increase in mass
(b) decrease in mass
(c) no change in mass when they are exposed to air?
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- Conc. sulphuric acid
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