Concentrated sulphuric acid and manganese(IV) oxide were added to the solid. On warming a gas was evolved which turned litmus colourless.
The answer is that Cl2 gas was evolved and chloride ion is present.
Can you please explain the reaction that took place?
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If you can get Cl2 gas from mixing H2SO4 and MnO2 and warming, you're a better chemist than I. Are you sure it wasn't concentrated HCl and MnO2?
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