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Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of
Options
(a) Al₂O₃ + HF + NaAlF₄
(b) Al₂O₃ + CaF₂ + NaAlF₄
(c) Al₂O₃ + Na₃AlF₆ + CaF₂
(d) Al₂O₃ + KF + Na₃AlF₆
Correct Answer:
Al₂O₃ + Na₃AlF₆ + CaF₂
Explanation:
Electrolytic mixture contains alumina (Al₂O₃), cryolite (Na₃AlF₆) and fluorspar(CaF₂) in the ratio of 20 : 40 : 20. Due to presence of these conductivity of alumina increases and fusion temperature decreases from 2000⁰C to 900⁰C.
Related Questions: - The pH value of 10⁻⁸ M HCl is
- Terylene is a condensation polymer of ethylene glycol and
- The number of carbon atoms in Buckminsterfullerene is
- Total number of isomers possible for the molecular formula C₄H₁₀O is
- Standard enthalpy of vaporisation Δvap H⁰ for water at 100⁰C is 40.66 kJ mol⁻¹.
Topics: Surface Chemistry and Isolation of Elements
(88)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The pH value of 10⁻⁸ M HCl is
- Terylene is a condensation polymer of ethylene glycol and
- The number of carbon atoms in Buckminsterfullerene is
- Total number of isomers possible for the molecular formula C₄H₁₀O is
- Standard enthalpy of vaporisation Δvap H⁰ for water at 100⁰C is 40.66 kJ mol⁻¹.
Topics: Surface Chemistry and Isolation of Elements (88)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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