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ICSE Class 10 Chemistry 2019 Solved Paper

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Distinguish between the following pairs of compounds using the reagent given in the bracket.
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Question : 52
Total: 86
Manganese dioxide and copper (II) oxide. (using concentrated HCl )
Solution:  
Conc. HCl with manganese dioxide heated it releases greenish yellow chlorine gas whereas with copper (II) oxide there is no visible reaction.
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