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Consider the following reaction
X + Al(NO3)3 (aq) → X(NO3)y (aq) + Al(s)
Using the provided Activity Series of Elements, determine which of the following elements could be X.

a. Copper b. Lead c. Iron d. Calcium

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Answer: Calcium

Explanation: an element need to reduce Iron in reaction.

Calcium is only metal in list which can reduce Iron

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