At which condition are hydrides of alkaline earth metals formed:
Correct answer: A. At high pressure
- A. At high pressure
- B. At room temperature
- C. At high temperature
- D. None of the above
Explanation
Explanation:Molten alkaline earth metal reacts with hydrogen at high pressure and in presence of catalyst forming hydrides. At room temperature, the hydrides of alkaline earth metals are not typically formed because the hydrogen molecules are not sufficiently energetic to react with the metal atoms. While high temperatures may promote the formation of hydrides, it is typically high pressures that are required to form stable hydrides of the alkaline earth metals
This question appeared on the UHS MDCAT 2009 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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