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BITSAT2020ChemistryIonic EquilibriumActual

A solution of NH ₄ Cl and NH ₃ has pH =8.0 . Which of the following hydroxides may be precipitated when this solution is mixed with equal volume of 0.2 M of metal ion.

Options

  1. ABa ( OH )₂ ( ~K _ sp =1.1 10⁻⁴ )
  2. BMg ( OH )₂ ( ~K _ sp =3.5 10⁻⁴ )
  3. CFe ( OH )₂ ( ~K _ sp =8.1 10⁻¹⁶ )
  4. DCa ( OH )₂ ( ~K _ sp =2.1 10⁻⁵ ) ).

Correct answer

C. Fe ( OH )₂ ( ~K _ sp =8.1 10⁻¹⁶ )

Step-by-step solution

pH =8, pOH =6 ; [ OH ⁻ ]=10⁻⁶ M Ionic product of Fe ( OH )₂=0.2 (1 10⁻⁶ )²=2 10⁻¹³> K _ sp (=8.1 10⁻¹⁶ )

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