An antique automobile bumper is to be chrome plated. The bumper, ...

[Redwolflake15]

Question 1

Ammonium metavandate reacts with sulfur dioxide in acidic solution as follows (hydrogen ions and H₂O omitted):
              xVO₃^– + ySO₂→ xVO²⁺ + ySO₄^2–
The ratio x : y is

◦ 1 : 1
◦ 1 : 2
◦ 2 : 1
◦ 1 : 3
◦ 3 : 1

Question 2

An antique automobile bumper is to be chrome plated. The bumper, which is dipped into an acidic Cr

₂

O

₇

^2-

solution, serves as a cathode of an electrolytic cell. The atomic mass of Cr is 51.996; 1 faraday = 96,485 coulombs. 

If oxidation of H₂O occurs at the anode, how many moles of oxygen gas will evolve for every 107 grams of Cr(s) deposited?

Reference: Ref 18-6

​

​

◦ 2.97
◦ 0.495
◦ 11.9
◦ 7.92
◦ 2.64

[Andromeda18]

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[naiah]

thank you