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Which equation represents the reduction half-reaction for this redox equation? Ca + Al(NO3)3 Al + Ca(NO3)2 A. Ca + Al Al + Ca B. Al Al + 2e- C. Al + 2e- Al D. Al + 3e- Al E. Al Al + 3e-

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Answer:

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The reduction half-reaction in this redox equation would be Al(NO3)3 to Al. You can calculate the oxidation number of the Al in Al(NO3)3 by noticing that it has 3 NO3 groups (each NO3 is a 1- charge), and that the molecule has a net charge of zero. This means that the Al in Al(NO3)3 is 3+ in oxidation state (to balance out the 3-), and it’s being reduced to 0 through the equation.

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