24. Four metals are arranged according to the decreasing tendency of liberating hydrogen gas from dilute a as follows: Ca, Zn, Fe,(H), Cu. In which of the following cases will a precipitate of the less react metal be obtained ? a) When zinc is added to an aqueous solution of copper sulfate b) When iron is added to an aqueous solution of calcium chloride C) When copper is added to an aqueous solution of calcium chloride d) When iron is added to an aqueous solution of zinc sulfate.
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l think the answer is c or d
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