Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?

  • A
    $Mg(OH)_2$
  • B
    $Ca(OH)_2$
  • C
    $Sr(OH)_2$
  • D
    $Ba(OH)_2$

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Identify correct statements from the following:
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$ii$. Group $II$ elements dissolve in liquid ammonia to form deep blue-black solutions.
$iii$. The hydration enthalpy of group $II$ ions decreases from $Be^{2+}$ to $Ba^{2+}$.

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