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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 $20.0 \,mL$ solution containing $0.2 \,g$ impure $H _{2} O _{2}$ reacts completely with $0.316 \,g$ of $KMnO _{4}$ in acid solution. The purity of $H _{2} O _{2}($ in $\%)$ is........... (mol. wt. of $H _{2} O _{2}=34 ;$ mol. wt. of $\left. KMnO _{4}=158\right)$
  • A
    $90$
  • B
    $95$
  • ✓
    $85$
  • D
    $80$
✓

Answer

Correct option: C.
$85$
c
$Eq$ of $H _{2} O _{2}= Eq$ of $KMnO _{4}$

$x \times 2=\frac{0.316}{158} \times 5$

$x=5 \times 10^{-3} mol$

$m _{ H _{2} O _{2}}=5 \times 10^{-3} \times 34=0.17 gm$

$\% H _{2} O _{2}=\frac{0.17}{0.2} \times 100=85$

 

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