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Q.

Aluminium is the most abundant metal in earth's crust. False statement about the metallurgy of Aluminium among the following is

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a

Bauxite is the chief ore of Aluminium

b

Alumina is a bad conductor of electricity

c

Sodium meta aluminate is insoluble in water

d

Cryolite is 3NaF.AlF3

answer is C.

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Detailed Solution

Alumina is a bad conductor, it is  mixed with Fluorspar and Cryolite to increase conductivity and decrease melting temperature.Bauxite is amphoteric.It can react with caustic soda to form a soluble Na[Al(OH)4].
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