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A student is conducting an experiment to study solubility of different substances in water. The experimental data is as follows
S.no Substances At 25^∘ C At 40^∘ C At 60^∘ C
1) CuSO_4 10" " g 15" " g 35" " g
2) NaCl 15" " g 15" " g 15" " g
3) KNO_3 12" " g 18" " g 30" " g
4) NaNO_3 6" " g 14" " g 25" "
Choose the correct statement
(i) 10 g of CuSO_4 in 100 g of water at 40^OCforms an unsaturated solution
(ii) 15 g of NaCl in 100 g of water at 60^OC forms a saturated solution
(iii) 30 g of KNO_3 in 100 g of water at 25^OC forms a supersaturated solution
(iv) A solution of 25 g of NaNO_ ₃in 100 g of water at 60^OC is cooled to25^OC forms a saturated solution by precipitating out 19 g of NaNO_3

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i, ii, iii only

ii, iii, iv only

i, ii, iv only

All

answer is C.

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Detailed Solution

At 40^OC , solubility of CuSO_4 is 15g. So it forms unsaturated solution by dissolving 10g CuSO_4 at .
Solubility of NaCl is 15 g at 60^OC . So it forms saturated solution at60^OC .
Solubility of KNO_3 is 12g at 25^OC and 30 g at 60^OC . So super saturated solution will form at 60^OC only.
Solubility of of NaNO_ ₃ at 25^OC is 6g and it increases to 25 g at 60^OC . By decreasing temperature NaNO_ ₃
precipitate out nearly 19 g at 25^OC .

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