The mass of carbon anode consumed (giving only carbondioxide) in the production of $270\, kg$ of aluminium metal from bauxite by the Hall process is
(Atomic mass $Al =27$ )
- 180 kg
- 270 kg
- 540 kg
- 90 kg
The Correct Option is D
Solution and Explanation
$ 2 Al _{2} O _{3} \longrightarrow 4 Al +3 O _{2} $
$ 4 C +3 O _{2} \longrightarrow 2 CO _{2}+2 CO \uparrow $
$ 2 Al _{2} O _{3}+4 C \longrightarrow 4 Al +2 CO _{2}+2 CO $
Only for removal of $CO _{2}$, following equation is possible
$\because$ For $108\, g$ of $Al , 36\, g$ of $C$ is required in above reaction
$\therefore$ For $270\, g$ of $Al$ require amount of $C$
$=\frac{36}{108} \times 270=90\, g$
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Concepts Used:
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What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal