Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency, atomic mass of Al = 27 g/mol)
|
Aluminium oxide may be electrolyzed at 1000°C to furnish aluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is |
Answer |
|
A certain current liberates 0.504 g of hydrogen in 2 hours. How many grams of oxygen can be liberated by the same current in same time? |
Answer |
|
The molar conductivities Λo |
Answer |
|
Aluminium displaces hydrogen from acids, but copper does not. A galvanic cell prepared by combining Cu/Cu2+ and Al/Al3+ has an emf of 2.0 V at 298 K. If the potential of copper electrode is +0.34 V, that of aluminium electrode is |
Answer |
|
The specific conductance of 0.1 M NaCl solution is 1.06 × 10–2 ohm–1 cm–1. Its molar conductance in ohm–1 cm2 mol–1 is |
Answer |
|
Among the following cells Primary cells are |
Answer |
|
The hydrogen electrode is dipped in a solution of pH 3 at 25°C. The potential would be (the value of 2.303 RT/F is 0.059 V) |
Answer |
|
When same quantity of electricity is passed for half an hour, the amount of Cu and Cr deposited are respectively 0.375 g and 0.30 g. Ratio of electrochemical equivalent of Cu and Cr is |
Answer |
|
Given the data at 25°C, Ag + I– → AgI + e– ; E° = 0.152 V Ag → Ag+ + e–; E° = –0.800 V What is the value of log Ksp for AgI? $\left(2.303dfrac{ ext{RT}}{ ext{F}} = 0.059 ext{ V} ight)$ |
Answer |
|
The quantity of electricity needed to separately electrolyze 1 M solution of ZnSO4, AlCl3 and AgNO3 completely is in the ratio of |
Answer |