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8. 7 gm of pyrolusite (impure MnO₂₎ were heated with concentrated HCl The Cl₂ gas evolved was passed through excess of KI solution. The iodine gas evolved required 80 ml of $\frac{N}{10}$ hypo solution.
The percentage of MnO₂ in pyrolusite will be : [Mn= 55)

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80 %

4 %

8 %

40 %

answer is A.

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Detailed Solution

The reaction can be given as,

${MnO}_{2} + 4 HCl ⟶ {MnCl}_{2} + 2 H_{2} O + {Cl}_{2}$

$[\frac{80 \times \frac{1}{10} \times \frac{1}{2} \times \frac{87}{1000}}{8.7}] \times 100 = 4 % {MnO}_{2}$

Hence, the percentage of MnO₂ in pyrolusite will be 4%.

Thus, the correct option is A.

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