Explain Aluminothermic process....

Explain Aluminothermic process.

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Metallic oxides such as `Cr_(2)O_(3)` can be reduced by an aluminothermic process. In this process, the metal oxide is mixed with aluminium powder and placed in a fire clay crucible. To initiate the reduction process, an ignition mixture (usually magnesium and barium peroxide) is used.
`"BaO"_(2)+Mg to"BaO"+"MgO"`
During the above reaction a large amount of heat is evolved (temperature upto `2400^(@)C`, is generated and the reaction enthalpy is : `852" kJ mol"^(-1)`) which facilitates the reduction of `Cr_(2)O_(3)` by aluminium power.
`"Cr"_(2)"O"_(3)+2Al overset(Delta)to2Cr+Al_(2)O_(3)`

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Assertion : Aluminothermic process is the extraction of chromium from chromic oxide. Reason : Alumina has a high melting point.

Both (A) and (R ) are true and (R ) is the correct explanation of (A).

Both (A) and (R ) are true and (R ) is not the correct explanation of (A).

(A) true but (R ) false.

Both (A) and (R ) are false.

In the aluminothermic process

`Al_2O_3 " is reduced by " Cr`

`Cr_2O_3 " is reduced by " Al`

`Al_2O_3 " is reduced by " C`

None of these corrcet

Ignition mixture used in aluminothermic process is ………….

`Mg + BaO_2`

`MgO + BaO`

`Al_2O_3 + Mg`

`Al_2O_3 + BaO_2`