Which of the following metal hydroxide is the least basic?

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

(i) Mg(OH)2

(ii) Ca(OH)2

(iii) Sr(OH)2

(iv) Ba(OH)2

Answer: (I) 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 MO bond becomes weaker.


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