MCQ
During estimation of oxalic acid $\,\,$ Vs $\,\,KMnO_4,$ self indicator is
- ✓$KMnO_4$
- Boxalic acid
- C$K_2SO_4$
- D$MnSO_4$
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[At. nos. $Zn = 30, Sc = 21, $$Ti = 22, Cr = 24$]
$E_{F{e^{ + 2}}/Fe}^o =- 0.44\,V$ and $E_{Au/A{u^{ + 3}}}^o = - 1.50\,V$