The correct statement is:

 

  • Option 1)

    leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate.

  • Option 2)

    the Hall-Heroult process is used for the production of aluminum and iron

     

  • Option 3)

    pig iron obtained from cast iron

  • Option 4)

    the blistered appearance of copper during the metallurgical process is due to the evaluation of  CO_{2} 

Answers (1)

 

 

leaching of Bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate 

It is Buyer's process

Al_{2}O_{3}+2NaOH \rightarrow 2NaA10_{2}+H_{2}O

sodium aluminate 

silica + NaOH \rightarrow sod. silicate

 


Option 1)

leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate.

Option 2)

the Hall-Heroult process is used for the production of aluminum and iron

 

Option 3)

pig iron obtained from cast iron

Option 4)

the blistered appearance of copper during the metallurgical process is due to the evaluation of  CO_{2} 

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