1. A voltaic cell is constructed using zinc metal in 0.1 M ZnSO4 solution and ni
ID: 909608 • Letter: 1
Question
1. A voltaic cell is constructed using zinc metal in 0.1 M ZnSO4 solution and nickel metal in 0.1 M NiSO4 solution. What is the reaction that is happening at the anode?
Zn2+(aq) + 2e Zn(s)
Ni2+(aq) + 2e Ni(s)
Zn(s) Zn2+(aq) + 2e
Ni(s) Ni2+(aq) + 2e
2. What mass of cobalt could be plated on an electrode from the electrolysis of a Co(NO3)2 solution with a current of 0.60 A for 50 s?
Question 2 options:
0.018 g Co(s)
0.056 g Co(s)
0.028 g Co(s)
0.0092 g Co(s)
0.018 g Co(s)
0.056 g Co(s)
0.028 g Co(s)
0.0092 g Co(s)
Explanation / Answer
1) Anode is where oxidation takes place (release of electrons)
Ni is above than Zn in electrochemical series. Hence Ni can reduce Zn. Zn canget oxidised.
Hence correct option is (C) Zn(s) Zn2+(aq) + 2e
2) Charge in coulomb = current x time
(0.6 A) x (50 sec) / (96485 C/mol e{-}) x (1 mol Pt / 2 mol e{-}) x (59 g /mol) = 0.00917 gram
Option D is correct.
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