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Question
Complete the statement using every given option.
During the extraction of aluminium.........
Heating the aluminium ore with concentrated caustic soda.
Short/Brief Note
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Solution
When aluminium ore is heated with caustic soda (NaOH) solution under high pressure for 2 to 8 hours at 140° - 150° C, water-soluble sodium aluminate is formed.
\[\ce{Al2O3 + 2NaOH -> 2NaAlO2 + H2O}\]
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