Redox Reactions And Electrochemistry Ques 347
Question: Which one of the following reactions does not involve either oxidation or reduction-
Options:
A) $ V{{O}^{+}}_2\to V_2O_3 $
B) $ Na\to N{{a}^{+}} $
C) $ Cr{{O}^{2-}}_4 $ $ \to Cr_2O_7^{2-} $
D) $ Z{{n}^{2+}}\to Zn $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ \overset{*}{\mathop{C}}rO_4^{2-} $
$ \overset{*}{\mathop{C}}r_2O_7^{2-} $
$ x+[(-2)\times 4]=-2 $ $ 2x+(-2)\times 7=-2 $ $ x=8-2=+6 $ $ 2x=14-2=12 $ $ x=\frac{12}{2}=+6 $ In this reaction oxidation and reduction are not involved because there is no change in oxidation number.
