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JEE Main Chemistry question

ChemistryRedox ReactionsJEE Main

4.35 g of pyrolusite ( mineral) is digested with conc. and added. The mixture required 5 mL of 1 M solution for complete reaction of the formed. What is the % of pure in the pyrolusite? ()

Answer: 5

Solution

MnO_2+2KI+4HCl\rightarrow MnCl_2+2KCl+I_2+2H_2O (, gain of 2 electrons, matching , loss of 2 electrons). Moles

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Question ID VK-146130