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Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry1 Mark
MCQ
$800 g$ of a $40\%$ solution by weight was cooled. $100g$ of solute was precipitated. The percentage composition of remaining solution is:
  • ✓
    $31.4\%$
  • B
    $20.0\%$
  • C
    $23.0\%$
  • D
    $24\%$
✓

Answer

Correct option: A.
$31.4\%$
Solutepresentin $800g$ solution $=800\times\frac{40}{100}=320\text{g}$
Soluteprecipitated $= 100g$
Soluteleft $= 220g$
$\therefore$ Totalweightofsolution $= 800 − 100 = 700g$
$700g $ solution has solute $= 220$
$100g$ solution has solute $=\frac{220}{700}\times100=31.43\%$

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