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The compound Ba(2)Cu(3)O(7), which shows...

The compound `Ba_(2)Cu_(3)O_(7)`, which shows super conductivity, has copper in oxidation state ......... Assume that the rare earth element yttrium is in its usual +3 oxidation state.

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`YBa_(2)Cu_(3)O_(7)` is neutral (+3) + 2 (+2) + 3 (x) + 7 (-2) = 0 , 3 + 4 + 3x -14 = 0
implies 3x + 7 -14 = 0 or x = +7/3
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