P-Block Elements Ques 31

Question: In the electrolytic extraction of aluminium, cryolite is used

[NCERT 1981; CPMT 1989; RPMT 2000; MP PMT 2000, 02]

Options:

A) To obtain more aluminium

B) To decrease temperature to dissolve bauxite

C) To protect the anode

D) As reducing agent

Show Answer

Answer:

Correct Answer: B

Solution:

Cryolite $ Na_3AlF_6 $ is added (1) To decrease the melting temp from $ 2323K $ to $ 1140K $ (2) To increase the electrical conductivity of solution



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