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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
Zinc sulphate contains $22.65\%$ of zinc and $43.9\%$ of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce $20\, g$ of the crystals will be ............. $\mathrm{g}$
  • A
    $45.3$
  • ✓
    $4.53$
  • C
    $0.453 $
  • D
    $453$
✓

Answer

Correct option: B.
$4.53$
b
(b) $100\, g$ of $ZnSO_4$ crystals are obtained from $= 22.65 \,g \,Zn$

$1\,g$ of $ZnSO_4$ crystals will be obtained from $  = \frac{{22.65}}{{100}}\,g \,Zn$

$20\, g$ of $ZnSO_4$ crystals obtained from $ = \frac{{22.65}}{{100}} \times 20 = 4.53\;g$

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