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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 sample of $NaClO_3$ is converted by heat to $NaCl$ with a loss of $0.16\, g$ of oxygen. The residue is dissolved in water and precipitated as $AgCl$. The mass of $AgCl$ (in $g$) obtained will be (Given: Molar mass of $AgCl = 143.5\, g\,mol^{-1}$ )
  • A
    $0.35$
  • B
    $0.54$
  • C
    $0.41$
  • ✓
    $0.48$
✓

Answer

Correct option: D.
$0.48$
d
No of moles of oxygen in $0.16\,g$ of oxygen molecule

$ = \frac{{0.16\,g}}{{32\,g/mol}} = 0.005\,mole$

$2NaCl{O_3}\xrightarrow{\Delta }2NaCl + 3{O_2}$

According to the reaction, 

$3$ moles of $O_2$ $=$ $2$ moles of $NaCl$ $=$ $2$ moles of $AgCl$

Molar mass of $AgCl = 143.5\,g/mol$

$0.005$ moles of $O_2$ will ppt. $ = 0.005 \times \frac{2}{3}$ moles $AgCl$

$= 0.0033$ moles of $AgCl$

$\therefore $ Mass of $AgCl$ (in $g$) obtained will be

$= 143.5\,g/mol \times 0.0033$ $moles$ $= 0.48\,g$

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