Cryolite (Na3AlF6) is essential in the electrolytic extraction of aluminum from alumina (Al2O3) due to the following reasons:
1. Melting Point Reduction: Alumina's melting point of approximately 2072°C is drastically reduced to 900°C - 1000°C by the addition of cryolite, improving energy efficiency and cost-effectiveness.
2. Solution Formation: Beyond lowering the melting point, cryolite functions as a solvent for alumina. This dissolution forms a conductive liquid mixture, crucial for effective electrolysis.
3. Electrical Conductivity: The presence of cryolite boosts the solution's electrical conductivity, ensuring efficient current flow for aluminum extraction.
4. Primary Function: The main justification for including cryolite is its ability to "Lower the melting point of alumina."
A solution of aluminium chloride is electrolyzed for 30 minutes using a current of 2A. The amount of the aluminium deposited at the cathode is _________
O\(_2\) gas will be evolved as a product of electrolysis of:
(A) an aqueous solution of AgNO3 using silver electrodes.
(B) an aqueous solution of AgNO3 using platinum electrodes.
(C) a dilute solution of H2SO4 using platinum electrodes.
(D) a high concentration solution of H2SO4 using platinum electrodes.
Choose the correct answer from the options given below :
Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12. The current in Amperes used for the given electrolysis is ….. (Nearest integer).