Which of the following statements is incorrect?

Question

Which of the following statements is incorrect?, In Hall-Heroult process, the electrolyte used is a molten mixture of alumina, sodium hydroxide and cryolite., Lead is extracted form its chief ore by both carbon reduction and self reduction., Tin is extracted from its chief ore by carbon monoxide reduction., Siderite and cassiterite are carbonate ores.

MARKS App · Accepted Answer

(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 .

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