(a) Complete the following equations : (i) Cr2O2−7+2OH−→ (ii – InterviewSolution

1.	(a) Complete the following equations : (i) Cr2O2−7+2OH−→ (ii) MnO−4+4H++3e−→ (b) Account for the following : (i) Zn is not considered as a transition element. (ii) Transition metals form a large number of complexes. (iii) The E0 value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+ couple.
Answer» (a) Complete the following equations : (i) $C r_{2} O_{7}^{2 -} + 2 O H^{-} \to$ (ii) $M n O_{4}^{-} + 4 H^{+} + 3 e^{-} \to$ (b) Account for the following : (i) Zn is not considered as a transition element. (ii) Transition metals form a large number of complexes. (iii) The $E^{0}$ value for the $M n^{3 +} / M n^{2 +}$ couple is much more positive than that for $C r^{3 +} / C r^{2 +}$ couple.

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