Class 12ChemistryGeneral Principles and Processes of Isolation of ElementsMix Examples of General Principles and processes of Isolation of Elements
DifficultWhich among the following statement$(s)$ is(are) true for the extraction of aluminium from bauxite?
$A$. Hydrated $Al_2O_3$ precipitates,when $CO_2$ is bubbled through a solution of sodium aluminate.
$B$. Addition of $Na_3AlF_6$ lowers the melting point of alumina.
$C$. $CO_2$ is evolved at the anode during electrolysis.
$D$. The cathode is a steel vessel with a lining of carbon.
$A$. Hydrated $Al_2O_3$ precipitates,when $CO_2$ is bubbled through a solution of sodium aluminate.
$B$. Addition of $Na_3AlF_6$ lowers the melting point of alumina.
$C$. $CO_2$ is evolved at the anode during electrolysis.
$D$. The cathode is a steel vessel with a lining of carbon.
- A$A, B, C$
- B$A, B, C, D$
- C$A, B$
- D$A, C$
Explore More
Similar Questions
Correctly match the List-$I$ with List-$II$:
List-$I$ List-$II$ $(P) \ [M(CN)_2]^-$ $(1) \ Ni$ (during refining of metal) $(Q) \ [M(CO)_4]$ $(2) \ Ti$ (during refining of metal) $(R) \ MI_4$ $(3) \ Pb$ (during roasting of ore) $(S) \ MO$ $(4) \ Ag$ (during leaching of ore)
| List-$I$ | List-$II$ |
| $(P) \ [M(CN)_2]^-$ | $(1) \ Ni$ (during refining of metal) |
| $(Q) \ [M(CO)_4]$ | $(2) \ Ti$ (during refining of metal) |
| $(R) \ MI_4$ | $(3) \ Pb$ (during roasting of ore) |
| $(S) \ MO$ | $(4) \ Ag$ (during leaching of ore) |
Medium
View SolutionHow is cement clinker obtained?
Easy
View SolutionMatch List-$I$ with List-$II$ and select the correct code.
List-$I$ List-$II$ $I.$ Cyanide process $a.$ Ultrapure $Ge$ $II.$ Froth floatation process $b.$ Pine oil $III.$ Electrolytic reduction $c.$ Extraction of $Al$ $IV.$ Zone refining $d.$ Extraction of $Au$
| List-$I$ | List-$II$ |
|---|---|
| $I.$ Cyanide process | $a.$ Ultrapure $Ge$ |
| $II.$ Froth floatation process | $b.$ Pine oil |
| $III.$ Electrolytic reduction | $c.$ Extraction of $Al$ |
| $IV.$ Zone refining | $d.$ Extraction of $Au$ |
Medium
View SolutionExtraction of copper from copper pyrite $CuFeS_2$ involves:
$A$. Crushing followed by concentration of the ore by froth-flotation
$B$. Removal of iron as slag
$C$. Self-reduction step to produce 'blister copper' following evolution of $SO_2$
$D$. Refining of 'blister copper' by carbon reduction
$A$. Crushing followed by concentration of the ore by froth-flotation
$B$. Removal of iron as slag
$C$. Self-reduction step to produce 'blister copper' following evolution of $SO_2$
$D$. Refining of 'blister copper' by carbon reduction
Which of the following is not correctly matched?
Medium
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo