The reaction you've written appears to involve nickel (Ni) and calcium nitrate (Ca(NO₃)₂). However, this reaction is not straightforward as calcium nitrate is primarily an ionic compound in solution.
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If you are considering a simple dual displacement reaction or metal displacement reaction, nickel does not displace calcium from calcium nitrate since calcium is higher in the activity series of metals than nickel.
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However, if you were to react nickel with calcium nitrate under specific conditions (like high heat), the products would depend on the reaction conditions, which could lead to the formation of metallic calcium and nickel compounds, but this is not a typical reaction.
If you were looking for a specific type of reaction or product, please clarify, and I would be happy to help further!