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What would you observe when (a) a satu...

What would you observe when
(a) a saturated solution of potassium chloride prepared at `60^(@)`C is allowed to cool at room temperature?
(b) an aqueous sugar solution is heated to dryness?
(c) a mixture of iron filings and sulphur powder is heated strongly?

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(a) Upon cooling, crystals of potassium chloride would separate.
(b) Initially, entire water slowly gets removed. Upon further heating, sugar gets charred and burning smell will be noticed.
(c ) Iron sulphide is formed as a greyish black residue.
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Pargya tested the solubility of four 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 from a saturated solutin). (a) What mass of potassium nitrate would be needed to procuce a strurated solution of potassium nitrate in 50 grams of water at 313 K ? (b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools ? Explain. (c ) Find the solubility of each salt at 293 K. Which salt has the highest solubility at this twmperature? (d) What is the effect of change in temperature on the solubility of a salt ?

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