Question

In the compound `Yba_(2)Cu_(3)O_(7)` which shows superconductivity, what is the oxidation state of `Cu` ?
Assume that the rare earth element yttrium is in its usual `+3` oxidation state.
A. `+(7)/(3)`
B. `-(7)/(3)`
C. `(5)/(3)`
D. `-(5)/(2)`

Answer 1

Correct Answer - A
`(Yba_(2)Cu_(3)O_(7))`
`3+(2xx2)+3x-14=0`
`:. X= +(7)/(3)`