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