Redox Reactions And Electrochemistry Ques 361
Question: In the following unbalanced redox reaction, $ Cu_3P+Cr_2O_7^{2-}\to C{{u}^{2+}}+H_3PO_4+C{{r}^{3+}} $ Equivalent weight of $ H_3PO_4 $ is
Options:
A) $ \frac{M}{3} $
B) $ \frac{M}{6} $
C) $ \frac{M}{7} $
D) $ \frac{M}{8} $
Show Answer
Answer:
Correct Answer: D
Solution:
[d] $ \underset{\underset{-3}{\mathop{\uparrow }},}{\mathop{Cu_3P}},\to \underset{\underset{+5}{\mathop{\uparrow }},}{\mathop{H_3PO_4}}, $ Change in oxidation number =8 units of phosphorus
$ \therefore $ Equivalent weight of $ H_3PO_4=\frac{M}{8} $
