Which of the following group II compounds is used in medicine as an antacid?
Correct answer: B. Magnesium hydroxide
- A. Barium sulphate
- B. Magnesium hydroxide
- C. Calcium carbide
- D. Beryllium chloride
Explanation
Magnesium hydroxide, sold as milk of magnesia, is a weak insoluble base that neutralises excess stomach acid without being absorbed in quantity. Barium sulphate is also used medically but as a contrast medium for X rays, and it is safe only because it is so insoluble that the toxic barium ions are not released. Beryllium compounds are highly toxic.
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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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