Four metals are arranged according to the decreasing tendency of lyberting hydrogen gas from dilute acid as follows Ca,Zn, Fe, (H), Cu in which of the following cases will a precipitate of the less reactive metal be obtained? (a) when zinc is added to an anqueous solution of copper sulfate (b) when iron is added to an anqueous solution of calcium chloride ( c ) when copper is added to an anqueous solution of calcium chloride ( d ) when iron is added an anqueous solution of zinc sulfate
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