In the extraction of Al, impure `Al_2O_3` is dissolved in conc. NaOH to form Sodium aluminate and leaving impurities behind. What is the name of the process.

In the reaction 3MnO_2 + 4Al rarr 3Mn + 2 Al_2O_3 the oxidising agent is

In the extraction of aluminium by Hall-Heroult process, purified Al_2O_3 is mixed with CaF_2 to

What is chemical nature of Al_2O_3 ?

Preparation of pure alumina (Al_2O_3) from bauxide ore.

A chloro derivative (A) on treatment with zinc copper couple gives a hydrocarbon (B) with five carbon atoms. When A is dissolved in ether and treated with sodium 2, 2, 5, 5- tetramethylhexane is formed. What is the formula of the compound A ?

The rection : Fe_2O_3 + 2Al rarr Al_2O_3 + 2Fe is an example of

Consider the reaction 3MnO_2+4Al rarr 3Mn+2Al_2O_3 Does aluminium act as an oxidising or reducing agent in this reaction ?

In the Hall process, aluminium is produced by the electrolysis of molten Al_2O_3 . How many second would it take to produce enough aluminium by the Hall process to make a case of 24 cans of auminium soft-drink, if each can uses 5.0g of Al, a current of 9650amp is employed and the current efficiency of the cell is 90%:

6.2g of a sample containing Na_2CO_3, NaHCO_3 and non-volatile inert impurity on gentle heating loses 5% of its mass due to reaction 2NaHCO_3 rarr Na_2 CO_3 + H_2 O + CO_2 . Residue is dissolved in water and formed 100mL solution and its 10mL portion requires 7.5 mL of 0.2M aqueous solution of BaCI_2 for complete precipitation of carbonates. Determine mass (in gram) of Na_2 CO_3 in the original sample.

Why the graphite rods in the extraction of aluminium from molten Al_2O_3 have to be replaced from time to time ?