MCQ
The colour of liquid ${O_2}$ is
- ARed
- BDark blue
- CPale yellow
- ✓Pale blue
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$Z{n^{2 + }} + 2e \to Zn,{E^o} = - 0.762\,V$
$M{g^{2 + }} + 2e \to Mg,{E^o} = - 2.37\,V$
When zinc dust is added to the solution of $MgC{l_2}$

[Given, atomic number: $Mn =25, Fe =26, Co =27$; en $= H _2 NCH _2 CH _2 NH _2$ ]
(Given: Atomic number: $V , 23 ; Cr , 24 ; Fe , 26;Ni , 28)$
$V ^{3+} \cdot Cr ^{3+}, Fe ^{2+}, Ni ^{3+}$