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