. Name the following metals: i. A metal present in cryolite other than sodium.


1. Name the following metals:

 i.A metal present in cryolite other than sodium.

 ii.A metal which is unaffected by dilute or concentrated acids.

 iii.A metal present in Period 3, Group 1 of the periodic table.

2. The following questions are relevant to the extraction of aluminium:

 i.State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.

 ii.Give a balanced chemical equation for the above reaction.

 iii.Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.

Best Answer

1. 

i. A metal present in cryolite other than sodium: Aluminium

ii. A metal which is unaffected by dilute or concentrated acids:

Aluminium

iii. A metal present in Period 3, Group 1 of the periodic table:

Sodium (Na)

2. 

i. Caustic alkali is added to bauxite ore during extraction as the insoluble part of bauxite is removed and the alumina component is then precipitated.

ii. The reaction is as follows:

Al2O3.2H2O + 2NaOH →2NaAlO2 + 3H2O

iii. Fluorspar is added along with cryolite and alumina because this helps the mixture to fuse at 950oCinstead of 2050oC ,and the aluminium obtained at this temperature is in the liquid state.

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