Which of the following statement(s) is (are) incorrect?

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In Serpeck's process silica is removed by heating the bauxite to 1800° C with coke in a current of $N_{2}$

In extraction of lead from galena roasting and self reduction takes place in the same furnac but under different conditions of teroperatur and supply of air

The tin is obtained by the carbon reduction of black tin

None of the above

answer is D.

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Detailed Solution

White bauxite includes the impurity of silica, which is eliminated by heating with coke in a stream of N= this is a true statement.

Option A- In Serpeck's procedure, silica is removed by heating the bauxite to 1800 degrees Celcius with coke in a current of $N_{2} .$ .

Roasting and self-reduction are carried out in the same furnace during the lead extraction process from galena but under distinct temperature and air supply conditions.

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