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The compound Yba2Cu3O7 which shows super...

The compound `Yba_2Cu_3O_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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The correct Answer is:
`7//3 overset(+3)ya overset(+2)Ba_(2)overset(x)Cu_(3)overset(-23)O_(7) therefore 3+4+3x-14 or x=7//3`
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