Harsh performed the following experiments in the laboratory. State one significant observation made by Harsh when: (a) he added concentrated sulphuric acid to blue vitriol. (b) he passed ammonia gas over heated PbO. (c) sodium hydroxide solution was added to CuSO4 solution by him.

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TextReduction of Metal Oxides to Metals

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TextReduction of Metal Oxides to Metals

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TextReduction of Metal Oxides to Metals