MCQ
Which statement is true for ferrocene?
- AAll $Fe-C$ are of equal length
- BIt has sandwich type structure
- CIt was the first discovered organometallic compound
- ✓All of these

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$I = -3.04\,V$,
$II = -1.90\,V$,
$III = 0\,V$,
$IV = 1.90\,V$

Product $(A)$ of above reaction is

Statement $-I :$ The pentavalent oxide of group$- 15$ element. $E _{2} O _{5}$. is less acidic than trivalent oxide. $E _{2} O _{3}$. of the same element.
Statement $-II :$ The acidic character of trivalent oxide of group $15$ elements. $E _{2} O _{3}$. decreases down the group.
In light of the above statements. choose most appropriate answer from the options given below