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ICSE Class X Notes 2024 : Chemistry : HCl concentrated

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ACTION OF CONCENTRATED HYDROCHLORIC ACID ON MANGANESE DIOXIDE Test Black amorphous Manganese dioxide is taken in the clean and dry test tube and then add concentrated hydrochloric acid Observation light brown coloured solution with the evolution of greenish yellow gas. Inference greenish yellow gas evolved may be chlorine Introduce a white coloured starch iodide into the test tube. Introduce a white coloured potassium iodide into the test tube. Introduce a red litmus paper into the test tube It turns blue black The gas evolved is chlorine gas It turns bluish black The gas evolved is chlorine gas - The red litmus paper bleaches The gas evolved is chlorine gas Mn02 oxidises Cone HCl Mn02 + 4HCI MnCl2+ 2H20 + Cl2 ACTION OF CONCENTRATED HYDROCHLORIC ACID ON COPPER OXIDE Test Black amorphous copper oxide is taken in the clean and dry test tube and then add concentrated hydrochloric acid Observation Blue green coloured solution is seen Filter the above solution Filterate is bluish in colour Add N}40H solution the filtrate Pale blue ppt is formed which is soluble in in excess of NH 40H to give deep blue solution Inference Blue green coloured solution is Copper chloride solution Copper oxide doesn't oxidise Conc.HCI CuO(s) + 2HCl(aq) = CuCl2(aq) + H20(1) CuCl2 + +Nf4Cl

 

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