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In \( \mathrm{YBa}_{2} \mathrm{Cu}_{3} \mathrm{O}_{7-\mathrm{x}} \), a superconducting oxide that got George Bednorz and Karl Muller the Noble prize in 1986, Cu can exist in both \( +2 \) and \( +3 \) oxidation states and their proportion depends on the value of ' \( x \) '.
\( \mathrm{P} \) In \( \mathrm{YBa}_{2} \mathrm{Cu}_{3} \mathrm{O}_{7-0.5} \)
(A) \( 0.5 \) moles of \( \mathrm{Cu} \) are in \( +3 \) oxidation state
(B) \( 5 \% \) of \( \mathrm{Cu} \) is in \( +3 \) oxidation sate
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(C) All the Cu is in \( +3 \) oxidation state
(D) All Cu is in \( +2 \) oxidation state
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