MCQ
Basicity of phosphinic acid is
- ✓$1$
- B$2$
- C$3$
- D$4$
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$Pt/ M/M^{3+}(0.001 \,mol\, L^{ -1})/Ag^+(0.01\, mol\, L^{-1})/Ag$
The emf of the cell is found to be $0.421\, volt$ at $298\, K$. The standard potential of half reaction $M^{3+} + 3e \to M$ at $298\, K$ will be .............. $\mathrm{volt}$
(Given $E_{A{g^ + }/Ag}^o $ at $298\, K\, = 0.80\, Volt$ )

$(I)$ the highest oxidation state of iron is $+ 6$ in $K_ 2FeO_4$
$(II)$ that the iron shows $+ 2$ oxidation state with six electrons in the $3d$ orbitals
$(III)$ the common oxidation state of iron is $+3$ with five unpaired electrons in $3d$ orbital