Transition and InnerTransition Elements - Result Question 153
####53. The compound $Y Ba _2 Cu _3 O _7$ which show super conductivity has copper in oxidation state …… assuming that the rare earth element Yttrium in its usual +3 oxidation state.
(1994, 1M)
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Answer:
Correct Answer: 53. $x=+7 / 3$
Solution:
- $Y=+3, \quad 2 Ba=2 \times 2=4$
$$ \begin{aligned} & 7{ }^{\prime} O^{\prime}=7 \times(-2)=-14 \ & 3+4+(-14)+3 x=0 \Rightarrow x=+\frac{7}{3} \end{aligned} $$
