The correct statement is :

Question:

The correct statement is :

  1. leaching of bauxite using concentrated $\mathrm{NaOH}$ solution gives sodium aluminate and sodium silicate

  2. the blistered appearance of copper during the metallurgical process is due to the evolution of $\mathrm{CO}_{2}$

  3. pig iron is obtained from cast iron

  4. the Hall-Heroult process is used for the production of aluminium and iron

Correct Option: 1

Solution:

(1) During leaching when bauxite is treated with concentrated $\mathrm{NaOH}$, then sodium aluminate and sodium silicate is formed in the soluble form, whereas $\mathrm{Fe}_{2} \mathrm{O}_{3}$ is precipitated

(2) The blistered appearance of copper during the metallurgical process is due to the evolution of $\mathrm{SO}_{2}$.

(3) Cast iron is obtained from pig iron.

(4) Hall-Heroult process is used for production of only aluminium.

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