Which of the following oxides of group 2 elements is amphoteric ?A. Sr

1.	Which of the following oxides of group 2 elements is amphoteric ?A. SrOB. BeOC. MgOD. CaO
Answer» Correct Answer - B As the atoms becomes larger, the ionization enthalpy decreases and the elements become more basec. BeO is in soluble in water but dissolved in acids to give salts `BeO+HCl toBeCl_(2)+H_(2)O` And in alkalis to give beryllates, which on stading precipitate as hydroxide. `BeO+NaOHtoNa_(2)BeO_(2)+H_(2)O` BeO is, therefore, amphoteric. MgO reacts with water forming `Mg(OH)_(2)` which is extermely insoluble in water and hence weakly basic. CaO Reacts `Ca(OH)_(2)` which is a moderately strong base. `Sr(OH)_(2)` and `Ba(OH)_(2)` are even stronger bases. the reaction of these oxides with water sometimes is known as slaking.

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Which of the following oxides of group 2 elements is amphoteric ?A. SrOB. BeOC. MgOD. CaO

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