P Block Elements Question 152
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 from bauxite
B) To increase temperature to dissolve bauxite
C) To protect the cathode
D) As a 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
BETA
