Down the group acid-base behaviour of metallic oxides of group 2 elements changes to:
Correct answer: A. More basic
- A. More basic
- B. No change
- C. Less basic
- D. More acidic
Explanation
Group II metal oxides become more basic as you go down the column. As the electronegativities of the metals decrease down the group, hence the change in electronegativity difference between the metal and oxygen increases down the group. The greater the difference in electronegativity the more ionic the metal-oxygen bond becomes. The more ionic the metal-oxygen bond the more basic the oxide is.
This question appeared on the UHS MDCAT 2018 paper, which you can sit online with every answer explained.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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