Redox Reactions And Electrochemistry Ques 526

Question: Which substance is serving as a reducing agent in the following reaction $ 14{{H}^{+}}+Cr_2O_7^{2-}+3Ni\to 2C{{r}^{3+}}+7H_2O+3N{{i}^{2+}} $ [CBSE PMT 1994; AFMC 2000; DPMT 2001]

Options:

A) $ H_2O $

B) $ Ni $

C) $ {{H}^{+}} $

D) $ Cr_2O_7^{2-} $

Show Answer

Answer:

Correct Answer: B

Solution:

The oxidation number of Ni changes from 0 to $ +1 $



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