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  4. A 2.0 g sample containing MnO 2 is treated with HCl liberating Cl 2. The Cl 2 gas is passed into a solution of KI and 60.0 mL of 0.1 M Na 2 S 2 O 3 is required to titrate the liberated iodine. The percentage of MnO 2 in the sample is (Nearest integer) [Atomic masses (in u) Mn =55 ; Cl =35.5 ; O =16, I =127, Na =23, K =39, S =32]

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Q. A $2.0 g$ sample containing $MnO _{2}$ is treated with $HCl$ liberating $Cl _{2}$. The $Cl _{2}$ gas is passed into a solution of KI and $60.0 mL$ of $0.1 M Na _{2} S _{2} O _{3}$ is required to titrate the liberated iodine. The percentage of $MnO _{2}$ in the sample is _______(Nearest integer)
[Atomic masses (in u) $Mn =55 ; Cl =35.5 ; O =16$, $I =127, Na =23, K =39, S =32]$

JEE MainJEE Main 2022Redox Reactions

Solution:

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$\% MnO _{2}=\frac{3 \times 10^{-3} \times 87}{2} \times 100$
$=13.05 \%$