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Sea water contains small quantities of M...

Sea water contains small quantities of `MgCl_(2) and MgS_(4)` Sea water is treated with slaked limeto precipitate the dissolved salty as `Mg(OH)_(2)` The `Mg(OH)_(2)` is dissolved in a little quantity of HCI and `MgCl_(2)6H_(2)O` is crystallised from solution. The hydrated `MgCl_(2)` is heated in a current of dry HCl gas to get anhydrous `MgCl_(2)` Pused anhydrous `MgCl_(2)` is subjected to electrolysis. Magnesium deposited at cathode.
Which of the following process is used in the extractive metallurgy of magnesium

A

Fused salt electrolysis

B

Self reduction

C

Aqueous solution electrolysis

D

Thermitt reduction

Text Solution

Verified by Experts

The correct Answer is:
A
Fused salt electrolysis is the process can be used for the extraction of more electro positive metals like Mg.
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Knowledge Check

  • Sea water contains small quantities of MgCl_(2) and MgS_(4) Sea water is treated with slaked limeto precipitate the dissolved salty as Mg(OH)_(2) The Mg(OH)_(2) is dissolved in a little quantity of HCI and MgCl_(2)6H_(2)O is crystallised from solution. The hydrated MgCl_(2) is heated in a current of dry HCl gas to get anhydrous MgCl_(2) Pused anhydrous MgCl_(2) is subjected to electrolysis. Magnesium deposited at cathode. Magnesium metal is extracted from

    A
    Carnalite
    B
    Magnesite
    C
    Sea water
    D
    All of these

  • Sea water contains small quantities of MgCl_(2) and MgS_(4) Sea water is treated with slaked limeto precipitate the dissolved salty as Mg(OH)_(2) The Mg(OH)_(2) is dissolved in a little quantity of HCI and MgCl_(2)6H_(2)O is crystallised from solution. The hydrated MgCl_(2) is heated in a current of dry HCl gas to get anhydrous MgCl_(2) Pused anhydrous MgCl_(2) is subjected to electrolysis. Magnesium deposited at cathode. In the Hanging method magnesia is a reved by using

    A
    Si
    B
    `CaC_(2)`
    C
    `FeSi`
    D
    Coke

  • On heating MgCl_(2). 2H_(2)O at 350^(@)C in the presence of anhydrous MgC_(2) , is formed

    A
    dry HCl
    B
    CO gas
    C
    `SO_(2)`
    D
    Air

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    (A): Magnesium metal can easily be extracted from sea water rather than sodium metal, (R): Mg(OH)_(2) is less soluble in water than NaOH.

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