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A mixture contains cobalt metal, copper metal, and tin metal. This mixture is mixed with nickel nitrate. Which metals, if any, will react?
A. Cobalt only
B. Copper only
C. Tin only
D. All 3

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Answer:Cobalt only.

Explanation:

Nickel is more electropositive than tin, copper or cobalt.

According to the reactivity series of metals in aqueous solution only cobalt have the chance to react in displacing Nickel in this aqueous solution.

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