NTA Abhyas JEE Main2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice
Which of the following statements is incorrect?
Options
- AIn Hall-Heroult process, the electrolyte used is a molten mixture of alumina, sodium hydroxide and cryolite.
- BLead is extracted form its chief ore by both carbon reduction and self reduction.
- CTin is extracted from its chief ore by carbon monoxide reduction.
- DSiderite and cassiterite are carbonate ores.
Correct answer
D. Siderite and cassiterite are carbonate ores.
Step-by-step solution
(i) Molten mixture of alumina and cryolite (ii) 2 PbS + 3 O 2 → 2 Pb + 2 S O 2 (self-reduction) PbS + 2 PbO → 3 Pb + S O 2 (Self reduction) PbO + C → P b + C O (carbon reduction) (iii) Sn O 2 + C → S n + C O (carbon reduction (iv) siderite = FeC O 3 , cassiterite = Sn O 2 and argentite = A g 2 S .