On electrolysing a solution of dilute H2SO4 between platinumelectrodes, the gas evolved at the anode is
(a) SO2 (b) IF5(c) O2 (d) H2
In between dilute H2SO4 and platinum electrode O2 gasevolve at anode.
Sodium is made by the electrolysis of a molten mixture of about40% NaCl and 60% CaCl2 because
(a) CaCl2 helps in conduction of electricity(b) This mixture has a lower melting point than NaCl(c) Ca++ can displace Na from NaCl(d) Ca++ can reduce NaCl to Na
Electrolysis of molten anhydrous calcium chloride produces
Calcium is produced when molten anhydrous calciumchloride is electrolysed.
The products formed when an aqueous solution of NaBr iselectrolysed in a cell having inert electrodes are
(a) Na and Br2 (b) Na and O2(c) H2, Br2 and NaOH (d) H2 and O2
At cathode H+ reduces to H2 and at anode Br– oxidises toBr2, leaving NaOH in the solution.
During electrolysis of aqueous NaOH, 4 g of O2 gas isliberated at NTP at anode, H2 gas liberated at cathode is