True/False
(1) Ore is heated strongly during calcinations to remove all volatile impurities
(2) Ore is heated with oxygen during roasting to convert sulphide to oxide
(3) Cryolite is added to bauxite in Hall Heroult’s process to increase solubility of bauxite in ____
(4) After leaching of bauxite, it is directly used as an electrolyte
(a) TTFF
(b) TTFT
(c) TTTF
(d) TFFT
