The major role of fluorspar, which is added in small quantities in the electrolytic reduction of `Al_(2)O_(3)` dissolved in fushed cryolite isA. as a catalystB. to make the fused mixture very condutingC. to lower the fusion temperature of metalD. to decreases the ate of oxidation of carbon at the anode.

The major role of fluorspar, which is added in small quantities in the

1.	The major role of fluorspar, which is added in small quantities in the electrolytic reduction of `Al_(2)O_(3)` dissolved in fushed cryolite isA. as a catalystB. to make the fused mixture very condutingC. to lower the fusion temperature of metalD. to decreases the ate of oxidation of carbon at the anode.
Answer» Correct Answer - B::C Fluorospar `(CaF_(2))` is added in small quantities to be melt in the extraction of Al. It makes the fused state more conducting. It lowers the s fusion temperature of the melt.

Discussion

No Comment Found

Related InterviewSolutions

Copper is purified by electrolysis in water solution and most of the impurities in the blister copper are left behind in solution. Why can not aluminium be unpaired in a similar manner ?A. Because Al ions are not produced in solutionB. Because Al ions are not reduced by electrolysis in a water solutionC. Because very few Al ions are reduced in water solutionD. None of the above
An alkali metal hybride `(NaH)` reacts with diborane in Y to give a tetrahedral compound Z, which is extensively used as reducing agent in organic synthesis. The Y and Z in the above reaction areA. `C_(2)H_(6), C_(2)H_(5)Na`B. `C_(2)H_(5)-O-C_(2)H_(5), NaBH_(4)`C. `NH_(3), B_(3)N_(3)H_(6)`D. `C_(3)H_(8), C_(3)H_(7)Na`
The types of hybridisation of boron in diborane isA. sp-hybridisationB. `sp^(2)`-hybridisationC. `sp^(3)`-hybridisationD. `sp^(3)d^(2)`-hybridisation
Name a metal other than aluminium that is covered with a layer of oxide film.A. AlB. AgC. AuD. Fe
The major role of fluorspar, which is added in small quantities in the electrolytic reduction of `Al_(2)O_(3)` dissolved in fushed cryolite isA. as a catalystB. to make the fused mixture very condutingC. to lower the fusion temperature of metalD. to decreases the ate of oxidation of carbon at the anode.
Which of the following is not correct in case of Boron nitride?A. It is also called borazoneB. It has magnetic propertiesC. It is hard because it has diamond like structureD. It is chemically unreactive
Both boron and aluminium show difference in properties from the remaining members of group 13. This becauseA. both B and Al have smaller size as compared to other members of the familyB. both B and Al have high values of ionization energyC. both B and Al have 2 and 8 electrons in their last but one shell respectively but the electrons in their last but one shellD. none of these
Which metal is protected by layer of its ownA. GoldB. AluminiumC. CopperD. Iron
Assertion (A) : In water, orthoboric acid acts as a weak monobasic acid. Reason (R) : In water orthoboric acid acts as a proton donor.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true
Inert pair effect plays an important role in case ofA. FB. AlC. SiD. Tl

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment