In the balanced equation , the values of and are: — Redox Reactions and Volumetric Analysis Chemistry Question
Question
In the balanced equation $Cr_2O_7^{2-} + xH^+ + ne^- \rightarrow 2Cr^{3+} + yH_2O$, the values of $x, n,$ and $y$ are:
Answer: A
💡 Solution & Explanation
Chromium in $Cr_2O_7^{2-}$ is $+6$ and goes to $+3$. Total change for 2 $Cr$ atoms = $2 \times 3 = 6$ ($n=6$). <br>To balance oxygen: 7 $O$ atoms require 7 $H_2O$ molecules ($y=7$). <br>To balance hydrogen: 14 $H$ atoms require 14 $H^+$ ions ($x=14$).
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