Question

In  the  extraction  of  aluminium
(1)     Name     the     process     of     concentration     of
Bauxite.
(2)     Write  the  cathode  reaction  in  electrolytic
reduction  of  alumina.
(3)     Write  the  function  and  formula  of  cryolite  in
the  extraction  of  aluminium.
(4)     Write  an  equation  for  the  action  of  heat  on
aluminium  hydroxide.
(5)     Draw     the     diagram     of     extraction     of
aluminium.
(6)     Why  is  it  necessary  to  replace  anodes  time
to  time?
(7)     What     happens     when     aluminium     ore     is
heated  with  concentrated  caustic  soda.  Write the  balanced chemical  equation  for  the
same.


MSCERT Class 10 General Science Ch8 Understanding Metals and Non Metals

Answer 1

Answers to your above questions are as follows-
(1)Bayer's Process
(2)Reaction is -  Al₃+ + 3e⁻ → Al
(3)As Alumina is having a very high melting point so Cryolite lowers the fusion temperature which enhances condutivity.
Chemical formula of Cryolite - AlF­3.3NaF 
(4)2Al(OH)­₃→Al₂O₃+3H₂O in this reaction heat given is 1000°C
(5)Diagram is in attachment file see it.
(6)It is necessary to replace anode time to time because in the electrolysis of alumina the anode gets oxidized.
(7)When it is heated water soluble sodium aluminate is formed.
Chemical equation-Al₂O₃ + 2NaOH → 2NaAlO₂ + H₂O 

Answer 2

Answer:

I don't know the answer

please try another place