The reduction half-reaction occurring in the standard hydrogen electrode is H2 (

Question

The reduction half-reaction occurring in the standard hydrogen electrode is H2 (g, 1 atm) rightarrow 2H + (aq, 1M) + 2e- 2H+ (aq) + 2OH- rightarrow H2O (1) O2 (g) + 4H + (aq) + 4e- rightarrow 2H2O (1) 2H+ (aq, 1M) + 2e- rightarrow H2 (g, 1 atm) 2H+ (aq, 1M) + C12 (aq) rightarrow 2HCl (aq) Corrosion of iron is retarded by the presence of salts high pH conditions low pH conditions both the presence of salts and high pH conditions both the presence of salts and low pH conditions Galvanized iron is iron coated with magnesium zinc chromium phosphate iron oxide How many minutes will take to plate out 2.19 g of chromium metal from a using a current of 19.5 amps in an electrolyte cell? 10.4 625

Explanation / Answer

5.- D)

6.-

The rate of corrosion is affected by water and accelerated by electrolytes. Because it forms hydroxide ions, this process is strongly affected by the presence of acid. Indeed, the corrosion of most metals by oxygen is accelerated at low pH, thus to corrosion of iron is retarded, with the opposite mentioned conditions, high pH, low concentration of electrolytes.

7,. Zinc, zinc has less tendency to oxydize

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