1.

Which of the following reaction is involved in the Hall's method of purification of bauxite ?

Answer»

`Al_(2)O_(3). 2H_(2)O + 2NaOH to 2NaAlO_(2) + 3H_(2)O`
`Al_(2)O_(3).2H_(2)O + Na_(2)CO_(3) to 2NaAlO_(2) + 2H_(2)O + CO_(2)`
`Al_(2)O_(3). 2H_(2)O + 3C + N_(2) to 2AlN + 3CO + 2H_(2)O`
`2Al_(2)O_(3) + 6F_(2) to 4AlF_(3)+ 3O_(2)`

ANSWER :B


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