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–
✓
Answer
- [Fe(C2O4)3]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.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If $Cu^+ + e^-\to Cu$ ; $E^o = X_1$, $Cu^{+2} + 2e^-\to Cu$ ; $E^o = X_2$ then the value of $E^o$ for $Cu^{+2} + e^-\to Cu^+$ will be
→In the reaction,$2KMn{O_4} + 16HCl \to 5C{l_2} + 2MnC{l_2} + 2KCl + 8{H_2}O$the reduction product is
→Which of the following does not have optical isomer
In a complexometric tritration of metal ion with ligand $M$ (Metalion) $+L$ (Ligand) $\to $ $C$ (Complex) end point is estimated spectrophotometrically (through light absorption) If $'M'$ and $'C'$ do not absorb light and only $'L'$ absorbs, then the titration plot between absorbed light $(A)$ versus volume of ligand $'L'$ $(V)$ would look like
→$CH_3 CH_2CH(OH)CH(CH_3)_2 + CH_3COCl \xrightarrow{base} $ $CH_3CH_2CH(OCOCH_3 )CH(CH_3)_2 + HCl$
→In the above reaction, if the reactant alcohol is a pure $R-$ isomer the product would.
The vapour pressure of water at $20\,^o C$ is $17.5\, mm\, Hg.$ If $18\, g$ of glucose $(C_6H_{12}O_6)$ is added to $178.2\, g$ of water at $20\,^o C,$ the vapour pressure of the resulting solution will be.........$\,mm\, of Hg$
→A current of $0.01\ amp$. is passed through a solution of a metal bromide $(M Br_x)$. The only reaction at the cathode is the deposition of metal $(M)$. After $3\ hours$, $0.072\ gm$ of metal $(M)$ is deposited. The value of $'x'$ is approximately (Given : Atomic wt. of $M = 192$)
→Choose the best sequence of reactions for transformation given . Semicolons indicate separate reaction steps to be used in the order shown.
For a cell reaction involving two electron change, the standard $EMF$ of the cell is $0.295\,V$ at $2\,^oC$. The equilibrium constant of the reaction at $25\,^oC$ will be
→Simplified absorption spectra of three complexes $((i),$$( ii)$ and $( iii ))$ of $M ^{ n +}$ ion are provided below; their $\lambda_{\max }$ values are marked as $A, B$ and $C$ respectively. The correct match between the complexes and their $\lambda_{\max }$ values is
→$(i)$ $\left[ M ( NCS )_{6}\right]^{(-6+ n )}$
$(ii)$ $\left[ MF _{6}\right]^{(-6+ n )}$
$(iii)$ $\left[ M \left( NH _{3}\right)_{6}\right]^{ n ^{+}}$