A current is passed through two voltameters connected in series. The first voltmeter connected in series. The first voltmeter contains XSO4(aq) while the second voltmeter contains Y2SO4(aq). The relative atomic masses of X and Y are in the ratio of 2:1. The ration of the mass of X liberated to the mass of Y liberated is:
1. 1:1
2. 1:2
3. 2:1
4. none of these
The mass of silver(eq. mass = 108) displaced by that quantity of current which displaced 5600 mL of hydrogen at STP is:
1. 54 g
2. 108 g
3. 5.4 g
4. none of these
A silver cup is plated with silver by passing 965 coulomb of electricity. The amount of Ag deposited is:
1. 1.08 g
2. 1.0002 g
3. 9.89 g
4. 107.89 g
A 5A current is passed through a solution of copper sulphate for 40 min. The amount of copper deposited at the cathode is:
1. | 40.65g | 2. | 0.45g |
3. | 3.94g | 4. | 65.04g |
Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 x 104 A of current is passed through molten Al2O3 for 6 h, what mass of aluminium is produced? (Assume 100% current efficiency, atomic mass of Al = 27g mol-1)
1. 9.0 x 103 g
2. 8.1 x 104 g
3. 2.4 x 105 g
4. 1.3 x 104 g
When 0.1 mole of MnO2-4 is oxidised, the quantity of electricity required to completely oxidise MnO2-4 to MnO-4 is
1. 96500 C
2. 2*96500 C
3. 9650 C
4. 96.50 C
What mass of copper will be deposited by passing 2 faraday of electricity through a solution of Cu(II) salt?
1. 35.6 g
2. 63.5 g
3. 6.35 g
4. 3.56 g
The same amount of electricity was passed through two cells containing molten Al2O3 and molten NaCl. If 1.8 g of Al were liberated in one cell, the amount of Na liberated in the other cell is:
1. 4.6 g
2. 2.3 g
3. 6.4 g
4. 3.2 g
During an electrolysis experiment, if a 100 mA current is passed through a solution of AgNO3 for 30 minutes, how many coulombs of electricity will be consumed?
1. 108 C
2. 18000 C
3. 180 C
4. 3000 C
When an electric current is passed through acidulated water, 112 mL of hydrogen gas at STP collects at the cathode in 965 second. The current passed, in ampere is:
1. 1.0
2. 0.5
3. 0.1
4. 2.0