Redox Reactions And Electrochemistry Ques 111
Question: The compound $ YBa_2Cu_3O_7 $ which shows superconductivity has copper in oxidation state …….. Assume that the rare earth element Yttrium is in its usual $ +,3 $ oxidation state [IIT 1994]
Options:
A) 3/7
B) 7/3
C) 3
D) 7
Show Answer
Answer:
Correct Answer: B
Solution:
$ Ba_2\overset{*}{\mathop{Cu_3}},O_7 $ $ 3+2\times 2+3x-(2\times 7)=0 $ $ 3+4+3x-14=0 $ $ 3x=7 $ $ x=\frac{7}{3} $ .
