MCQ
Amongst the following, the most stable complex is:
- A[Fe(H2O)6]3+
- B[Fe(NH3)6]3+
- C[Fe(C2O4)3]3–
- D[FeCl6]3–
In each of the given complex, Fe is in +3 oxidation state. As C2O42- is didentate chelating ligand, it forms chelate rings and hence (c) out of complexes given above is the most stable complex.
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| column $(I)$ | column $(II)$ | ||
| $(A)$ | Kohlraush law | $(i)$ | $\Lambda _{eq}^o = \Lambda _c^o + \Lambda _a^o$ |
| $(B)$ | Molar Conductivity |
$(ii)$ | $\Lambda _m = \frac{{K \times 1000}}{M}$ |
| $(C)$ | Degree of Dissociation |
$(iii)$ | $\alpha = {\Lambda _m}/\Lambda _m^o$ |
| $(D)$ | Dissociation Constant |
$(iv)$ | ${k_a} = C{\alpha ^2}/1 - \alpha $ |