Question

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. $Ba(OH)_{2}$

Answer 1

Answer: (A)

$Mg(OH)_{2}$

Answer 2

: The basic character of metal hydroxides increases down the group from $Mg(OH)_{2}$ to $Ba(OH)_{2}$ due to increase in size, ionization enthalpy decreases and the M – O bond becomes weaker.