(Answered) Aluminum displaces cobalt from a 02 m solution of cobaltii

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Aluminum displaces cobalt from a 0.2 M solution of cobalt(II) perchlorate. Cobalt does not displace chromium from a solution of 0.2 M chromium (III) nitrate. Aluminum metal does not displace calcium from a 0.2M solution of calcium nitrate. Aluminum metal displaces chromium from a solution of 0.2 M chromium (III) nitrate. Write an activity series, most active to least active, based on this data.

Ca > Al > Cr > Co
Co>Cr>Al>Ca
Al>Ca>Co>Cr
Al>Cr>Ca>Co

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