English

The process of leaching alumina, using sodium carbonate is called - Chemistry

Advertisements
Advertisements

Question

The process of leaching alumina, using sodium carbonate is called

  • Bayer's process
  • Decomposition
  • Cyanide process
  • Hall's process

Solution

Hall’s process
In Hall’s process, the ore and sodium carbonate are fused to convert aluminium oxide into soluble sodium meta aluminate.

shaalaa.com
  Is there an error in this question or solution?
2015-2016 (March)

APPEARS IN

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Write chemical formulae of the following ores :

(a) Calamine 

(b) Haematite                     

(c) Magnetite

(d) Corundum


Out of C and CO, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore?


Fe2O3 is reduced to spongy iron near the top of blast furance by

(A) H2

(B) CaO

(C) SiO2

(D) CO


Mention names and formulae of two ores of alumunium.


Purification of aluminium by electrolytic refining is carried out by

(a)Hoope process

(b)Hall process

(c)Baeyer process

(d)Serperck process


What is the role of cryolite in the extraction of aluminium?


In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?


What is the role of coke in the extraction of iron from its oxides?


Which of the ores mentioned can be concentrated by magnetic separation method?


Differentiate between “minerals” and “ores”.


Define Leaching.


Explain the following methods to protect metals from corrosion:

Galvanization


Why does copper obtained in the extraction from copper pyrites have a blistered appearance?


What is the role of the following compound- 
SiO2 in the extraction of copper from copper pyrites?


What happens when a nickel rod is dipped into a copper sulphate solution? Justify your answer.

`[E_((Ni^(+2))/(Ni))^0 = -0.25"v" and E  _(("Cu"^(+2))/("Cu"))^0 = +0.34"v"]`


Describe the role of the Cryolite in the extraction of aluminium from pure alumina.


How will you convert the following:
[Ag(CN)2] to Ag


Give the uses of zinc.


Metal which is found in free state is:


Which among the following statement is correct?


The most abundant metal on earth is:


When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains ______.


Which of the following options are correct?

(i) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.

(ii) In extraction of silver, silver is extracted as cationic complex.

(iii) Nickel is purified by zone refining.

(iv) Zr and Ti are purified by van Arkel method.


Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.


In the thermite process, the reducing agent is:


Metal always found in Free State is 


Pyrolusite is ______.


Match List I with List II.

List - I List - II
a. Siderite I. FeCO3
b. Malachite II. CuCO3 · Cu(OH)2
c. Sphalerite III. ZnS
d. Calamine IV. ZnCO3

Choose the correct answer from the option given below.


Calamine and Malachite, respectively, are the ores of ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×