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CBSE Class 11-science Answered

5g of pyrolusite were heated with conc. HCl and Cl2 evolved was passed through excess of KI solution. The iodine liberated required 40 mL of N/10hypo solution.Find the % of MnO2 in the pyrolusite.
Asked by dineshchem108 | 17 Jul, 2018, 06:02: PM
answered-by-expert Expert Answer
The space reaction space involves space as space follows colon MnO subscript 2 space plus space 4 HCl space rightwards arrow with blank on top space MnCl subscript 2 space plus space Cl subscript 2 space plus space 2 straight H subscript 2 straight O Cl subscript 2 space plus space 2 KI space rightwards arrow with blank on top space straight I subscript 2 space plus space 2 KCl straight I subscript 2 space plus 2 NaS subscript 2 straight O subscript 3 space rightwards arrow with blank on top space 2 NaI space plus space Na subscript 2 straight S subscript 4 straight O subscript 6        
 Meq. space of space MnO subscript 2 space equals space Meq. space of space Cl subscript 2 space equals space Meq. space of space hypo rightwards double arrow space Meq. space of space MnO subscript 2 equals space Meq. space of space hypo straight m over 87 cross times 2 cross times 10 cubed equals space 40 space cross times 1 over 10 space straight m equals space fraction numerator 40 cross times 87 cross times 10 to the power of negative 3 end exponent over denominator 10 cross times 2 end fraction space equals space 2 space cross times space 87 cross times 10 to the power of negative 3 end exponent straight g Hence space percent sign purity space of space MnO subscript 2 space equals fraction numerator straight m over denominator given space mass end fraction equals space fraction numerator 2 space cross times space 87 cross times 10 to the power of negative 3 end exponent over denominator 5 end fraction space cross times 100 space equals space fraction numerator 17.4 over denominator 5 end fraction space equals space 3.48 space percent sign
Answered by Ramandeep | 19 Jul, 2018, 12:39: PM

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