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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