Coke powder is spread over the molten electrolyte to :

prevent the heat radiation from the surface

No worries! We‘ve got your back. Try BYJU‘S free classes today!

prevent the corrosion of graphite anode

No worries! We‘ve got your back. Try BYJU‘S free classes today!

prevent the oxidation of molten aluminium by air

No worries! We‘ve got your back. Try BYJU‘S free classes today!

both (a) and (b)

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is C both (a) and (b)
In the Hoop's process carbon dust is sprayed over molten Al to
– avoid heat lose
– minimise metallic lusture (glaze) which is harmful for the eyes.

Suggest Corrections

Similar questions

Q. Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide. Identify the type of the reaction:

Q. Consider the following isolation/purification processes.

(I) Heating impure metal with

I_{2}

150 - 200^{\circ} C

and passing the resulting volatile iodide on hot tungsten filament at

1400^{\circ} C

to get the pure metal.
(II) Heating the sulphide ore in the air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide to get the metal.
(III) Electrolysis of the molten electrolyte containing metal oxide and cryolite or fluorspar to obtain the metal.

The processes used for obtaining aluminium, titanium and lead are respectively :

Aluminium is obtained by the electrolysis of molten aluminium oxide. A metal just below aluminium in the reactivity series can be extracted by which method easily:

Q. in a electrolytic tank aluminium metal is being extracted by d electrolysis of molten aluminium oxide using carbon electrodes.Ot is observed that one of the carbon electrodes is gradually burnt away and has to be replaced
i)Which carbon electrode is burnt away and Why?
Briefly explain

Q. Aluminum is extracted from alumina (

A l_{2} O_{3}

) by electrolytes of a molten mixture of

Join BYJU'S Learning Program

Coke powder is spread over the molten electrolyte to :

The correct option is C both (a) and (b)In the Hoop's process carbon dust is sprayed over molten Al to – avoid heat lose – minimise metallic lusture (glaze) which is harmful for the eyes.

The correct option is C both (a) and (b)
In the Hoop's process carbon dust is sprayed over molten Al to
– avoid heat lose
– minimise metallic lusture (glaze) which is harmful for the eyes.