Question:
The correct statement is :
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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