The compound \( \mathrm{YbBa} \mathrm{a}_{2} \mathrm{Cu}_{3} \mathrm{O}_{7} \) which shows super...

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The compound \( \mathrm{YbBa} \mathrm{a}_{2} \mathrm{Cu}_{3} \mathrm{O}_{7} \) which shows superconductivity, has copper in oxidation state
Assume that the rare earth element ytterbium is in the usual \( +3 \) oxidation state.
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