Difficult
Cryolite is
- A$Na_{3}AlF_{6}$ and is used in the electrolysis of alumina for decreasing electrical conductivity.
- B$Na_{3}AlF_{6}$ and is used in the electrolysis of alumina for lowering the melting point of alumina only.
- C$Na_{3}AlF_{6}$ and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina.
- D$Na_{3}AlF_{6}$ and is used in the electrolytic refining of alumina.
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Similar Questions
Given below are two statements.
Statement $I:$ The choice of reducing agents for metals extraction can be made by using Ellingham diagram,a plot of $\Delta G$ vs temperature.
Statement $II:$ The value of $\Delta S$ increases from left to right in Ellingham diagram.
In the light of the above statements,choose the most appropriate answer from the options given below:
Statement $I:$ The choice of reducing agents for metals extraction can be made by using Ellingham diagram,a plot of $\Delta G$ vs temperature.
Statement $II:$ The value of $\Delta S$ increases from left to right in Ellingham diagram.
In the light of the above statements,choose the most appropriate answer from the options given below:
Among the following,the main reactions occurring in the blast furnace during the extraction of iron from haematite are:
$i$. $Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2$
$ii$. $FeO + SiO_2 \rightarrow FeSiO_3$
$iii$. $Fe_2O_3 + 3C \rightarrow 2Fe + 3CO$
$iv$. $CaO + SiO_2 \rightarrow CaSiO_3$
$i$. $Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2$
$ii$. $FeO + SiO_2 \rightarrow FeSiO_3$
$iii$. $Fe_2O_3 + 3C \rightarrow 2Fe + 3CO$
$iv$. $CaO + SiO_2 \rightarrow CaSiO_3$
MediumKCET 2019
View SolutionThe Ellingham diagram represents:
Medium
View SolutionIn the production of iron,limestone is added to the blast furnace. At the end of the process,the $Ca$ ion is in the form of.......
Easy
View SolutionCarbon cannot be used in the reduction of $Al_2O_3$ because
Medium
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