22349.What is the electrochemical equivalent (in g coulomb–1) of silver? (Ag = 108; F = Faraday)
108F
108/F
F/108
1/108F
22350.What is the reduction electrode potential (in volts) of copper electrode when [Cu2+]= 0.01 M in a solution at 25°C? (E° of Cu2+/Cu electrode is +0.34 V)
0.3991
0.2809
0.3105
0.3695
22351.A current of 0.5 amperes is passed for 30 minutes through a voltmeter containing CuSO4 solution. Find the weight of Cu deposited.
3.18 g
0.318 g
0.296 g
0.150 g
22352.The dissociation constant of a work acid is 1 × 10–4. In order ofprepare a buffer solution with a pH = 5 the [Salt]/[Acid] ratio should be
1 : 10
4 : 5
10 : 1
5 : 4
22353.Consider the following cell reaction:
2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq) + 2H2O(l); E° = 1.67 V
At [Fe2+] = 10–3 M, P(O2) = 0.1 atm and pH = 3, the cell potential at 25°C is
1.47 V
1.77 V
1.87 V
1.57 V
22354.When 3.86 amperes current is passed through an electrolyte for 50 minutes, 2.4 grams of adivalent metal is deposited. The gram atomic weight of the metal (in grams) is
24
12
64
40
22355.When electric current is passed through acidified water for 1930 seconds, 1120 mL of H2 gas is collected (at STP) at the cathode. What is the current passed in amperes?
0.05
0.50
5.0
50
22357.How is electrical conductance of a conductor related with length and area of cross section of the conductor ?
G = $l$ . a. k–1
G = k . $l$ . a–1
G = k . a . $l$–1
G = k . $l$ . a–2