Verified Solution • 2025–26 Session moderate

QAIPM-2012-Ch-1713: NEET 2012 Chemistry - Class 11 AIPM-2012-Ch-1713 Solution: Aluminium is extracted from alumina (\(Al_2O_3\)) by…

Aluminium is extracted from alumina (Al2O3Al_2O_3) by electrolysis of a molten mixture of Al2O3+HF+NaAlF4Al_2O_3 + HF + NaAlF_4 Al2O3+CaF2+NaAlF4Al_2O_3 + CaF_2 + NaAlF_4 Al2O3+Na3AlF6+CaF2Al_2O_3 + Na_3AlF_6 + CaF_2 Al2O3+KF+Na3AlF6Al_2O_3 + KF + Na_3AlF_6

Multiple Choice Options

  • A 3.3 ×\times _ 10 −- _ 7
  • B 5.0 ×\times _ 10 −- _ 7
  • C 4.0 ×\times _ 10 −- _ 6
  • D 5.0 ×\times _ 10 −- _ 6

Step-by-Step Verified Solution

Ba(OH) 2 | _ | Ba 2+ | + | 2OH At equilibrium | x | 2x pH = � log[H + ] 12 = � log [H + ] _ [H + ] = 10 �12 As, [H + ][OH � ] = 10 �14 10 �12 [OH � ] = 10 �14 _ [OH � ] = 10 �2 As [OH � ] = 2x = 10 �2 then x = 5.0 _ 10 �3 Now, K sp = [Ba 2+ ][OH � ] 2 K sp = (5 _ 10 �3 ) (10 �2 ) 2 = 5.0 _ 10 �7

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