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प्रश्न
Complete the statement using every given option.
During the extraction of aluminium.........
Heating the aluminium ore with concentrated caustic soda.
टीपा लिहा
उत्तर
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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