Name two substances whose solubility :
(i)Increases with the rise in temperature.
(ii)remains practically unaffected with the rise in temperature.
(iii)decreases with the rise in temperature.

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Solution

(i)Two substances whose solubility increases with the rise in temperature:
KNO₃ (Potassium Nitrate)
NaNO₃(Sodium Nitrate)
(ii)Two substances whose solubility remains practically unaffected with the rise in temperature:
Sodium chloride(NaCl)
Potassium chloride(KCl)
(iii)Two substances whose solubility decreases with the rise in temperature:
Calcium hydroxide(Ca(OH)₂)
Calcium sulfate(CaSO₄)

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Normally, solubility of a crystalline solid increase with temperature. Does it increase uniformly in all cases ? Name a substance whose solubility :

(a) increase rapidly withe temperature.

(b) increase gradually with temperature.

(d) initially increases then decreases with rise in temperature.

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