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  4. Atomic weight of barium is 137.34. The equivalent weight of barium in BaCrO 4 used as an oxidizing agent in acid medium is

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Q. Atomic weight of barium is $137.34$. The equivalent weight of barium in $BaCrO _4$ used as an oxidizing agent in acid medium is

Some Basic Concepts of Chemistry

Solution:

$CrO _4^{2-}$ (and not $Ba ^{2+}$ ) is involved as an oxidizing agent and reduced to $Cr ^{3+}$, hence, $E w=\frac{M w}{3}$