MCQ
Identify $'A'$ in the reaction


- A

- B

- ✓

- D








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| LIST-I (Complex/Species) | LIST-II (Shape & magnetic moment) | ||
| A. | $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ | I. | Tetrahedral, 2.8 BM |
| B. | $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ | II. | Square planar, 0 BM |
| C. | $\left[\mathrm{NiCl}_{4}\right]^{2-}$ | III. | Tetrahedral, 0 BM |
| D. | $\left[\mathrm{MnBr}_{4}\right]^{2-}$ | IV. | Tetrahedral, 5.9 BM |
$E_{F{e^{ + 2}}/Fe}^o =- 0.44\,V$ and $E_{Au/A{u^{ + 3}}}^o = - 1.50\,V$
