Some Basic Concepts of Chemistry - Result Question 27

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27. The compound $YBa _2 Cu _3 O _7$, which shows super conductivity, has copper in oxidation state ________ Assume that the rare earth element yttrium is in its usual +3 oxidation state.

(1994,1 M)

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Answer:

Correct Answer: 27. 7/3

Solution:

If $x$ is the oxidation state of Cu then :

$3+2 \times 2+3 x+7 \times(-2)=0 \Rightarrow x=\dfrac{7}{3}$

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