Statement-1:In the electrolytic reduction of `Al_(2)O_(3)`, cryolite lowes the melting point of the mixture and bring conductivity: Statement-2: Cryolite is an ore of aluminium.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True.

Statement-1:In the electrolytic reduction of `Al_(2)O_(3)`, cryolite l

1.	Statement-1:In the electrolytic reduction of `Al_(2)O_(3)`, cryolite lowes the melting point of the mixture and bring conductivity: Statement-2: Cryolite is an ore of aluminium.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True.
Answer» Correct Answer - B Statement-1: Cyrolite as impurity reduces the melting point of `Al_(2)O_(3)` from 2200K to approximately 930K and being ionic compound dissociates to give ions which bring about the conductivity of the electrolyte. Statement-2: Cryolite is `Na_(2)AlF_(4)` and is ore of aluminium. Therefore, (b) is correct.

Discussion

No Comment Found

Related InterviewSolutions

Which of the following is better reducing agent at 673K in pyrometallurgy?A. CB. `CO_(2)`C. COD. None of these
By which process Pba and Sn are extracted respectively are:A. Carbon reduction and self reductionB. self reduction and Carbon reductionC. electrolytic reduction and cynanide processD. cynanide process and electrolytic reduction
In which of the following isolations no reducing agent is requiredgtA. Iron from haematiteB. Tin from cassiteriteC. Mercury from cinnabarD. Zinc from zinc blende
In which of the following extraction no reducing agent is required?A. Iron from haematitreB. Aluminium from bauxiteC. Magnesium from carnalliteD. Zinc from zinc blende
Statement-1: Carbon cannot be used as a reducing agent for the extraction of second group metals. Statement-2: Second group metals are extracted from their fused salts by electrolytic reduction:A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True.
Railway wagon axles are made by heating rods of iron embedded in charcoal powerder. The process is known asA. sherardisingB. annelalingC. temperingD. case hardening
Galvanisation is applying a coating ofA. ZnB. PbC. CrD. Cu
Roasting of copper pyrites is done:A. to remove moistureB. to oxidise free sulphur and antimonyC. to convert pyrite completely into `Cu_(2)O and FeO`D. to remove volatle organic impurities
Which of the following options are observed during roasting?A. Convert sulphide to oxide and sulphateB. Remove water of hydrationC. Melt the oreD. Remove arsenic and sulphur impurities
Roasting can be performed in:A. blast furnaceB. reveberatory furnaceC. electric furnaceD. None of these

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment