Magnesium reacts with hydrogen at high pressure in the presence of catalyst _ forming magnesium hydride.
Correct answer: B. Mgl2
- A. Dolomite.
- B. Mgl2
- C. Mg3N2
- D. Epsom salt
Explanation
In 1951 preparation from the elements was first reported involving direct hydrogenation of Mg metal at high pressure and temperature (200 atmospheres, 500 °C) with MgI2 catalyst: Mg + H2 → MgH.
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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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