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Question
State the observation for the following, when:
Manganese dioxide reacts with concentrated HCl.
Short Note
Solution
When manganese dioxide gas reacts with concentrated HCl then the liberation of greenish-yellow gas is observed. This gas is chlorine which turns moist iodide starch paper blue-black. The reaction is given as:
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
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Distinguish Between Black Copper Oxide and Black Manganese Dioxide
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