First slide

Activity Series (OR) Electro chemicals series

Question

Compound XA, XB, XC are added into separate test tubes containing A, B, C solutions. XB react with A and C. XA does not react with any of these. XC reacts with A.
Arrange the anion in the decreasing order of their oxidation.

Moderate

A

$A^{-}, B^{-}, C^{-}$
B

$B^{-}, C^{-}, A^{-}$
C

$C^{-}, A^{-}, B^{-}$
D

$B^{-}, A^{-}, C^{-}$

Solution

$Oxidising tendency \propto \frac{I}{electro potential}$
$XA \to No reaction XB \to A, C XC \to A$
Order of electrode potential is XB < XC < XA.
Order of oxidation of anion $B^{-} > C^{-} > A^{-}$ .

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