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  4. Which substance is serving as a reducing agent in the following reaction? 14 H ++ Cr 2 O 72-+3 Ni arrow 7 H 2 O +2 Cr 3++3 Ni 2+

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Q. Which substance is serving as a reducing agent in the following reaction?
$14 H ^{+}+ Cr _{2} O _{7}^{2-}+3 Ni \rightarrow 7 H _{2} O +2 Cr ^{3+}+3 Ni ^{2+}$

Solution:

Ni looses $e^{-}$ so its reducing agent