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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
A given initial mass of $KClO_3$ on $50\%$ decomposition produces $67.2\ litre$ oxygen gas at $0\,^oC$ and $1\ atm$ . The other product of decomposition is $KCl$ . The initial mass of $KClO_3$ (in $gm$) taken is.
  • A
    $245$
  • B
    $122.5$
  • ✓
    $490$
  • D
    None of these
✓

Answer

Correct option: C.
$490$
c
$\mathrm{KClO}_{3} \rightarrow \mathrm{KCl}+\frac{3}{2} \mathrm{O}_{2}$

$\mathrm{m}$

mass

decomposed $=\frac{50 \mathrm{m}}{100} \quad \frac{3}{2} \times \frac{50 \mathrm{m}}{100 \times 122.5}$

moles $=\frac{50 \mathrm{m}}{100 \times 122.5}=\frac{67.2}{22.4}, \mathrm{m}=490\, \mathrm{gm}$

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