Question:
Which one of the following alkaline earth metals does not form hydride when it is heated with hydrogen directly?
Which one of the following alkaline earth metals does not form hydride when it is heated with hydrogen directly?
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Beryllium (Be) does not form hydrides directly because of its high ionization energy and its tendency to form covalent bonds rather than ionic bonds.
Updated On: Mar 24, 2025
- Be
- Mg
- Ca
- Sr
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The Correct Option is A
Solution and Explanation
Step 1: Understanding Hydride Formation
Alkaline earth metals react with hydrogen to form hydrides. However, not all elements in this group readily form hydrides when heated with hydrogen.
Step 2: Analyzing Each Metal - Be (Beryllium): Beryllium does not form a simple hydride by direct reaction with hydrogen because it has a strong covalent character and does not easily bond with hydrogen. - Mg (Magnesium): Magnesium forms magnesium hydride (MgH₂) when heated with hydrogen. - Ca (Calcium): Calcium readily reacts with hydrogen to form calcium hydride (CaH₂). - Sr (Strontium): Strontium forms strontium hydride (SrH₂) when heated with hydrogen.
Step 3: Conclusion The correct answer is Beryllium (Be) because it does not form a hydride directly by heating with hydrogen.
Step 2: Analyzing Each Metal - Be (Beryllium): Beryllium does not form a simple hydride by direct reaction with hydrogen because it has a strong covalent character and does not easily bond with hydrogen. - Mg (Magnesium): Magnesium forms magnesium hydride (MgH₂) when heated with hydrogen. - Ca (Calcium): Calcium readily reacts with hydrogen to form calcium hydride (CaH₂). - Sr (Strontium): Strontium forms strontium hydride (SrH₂) when heated with hydrogen.
Step 3: Conclusion The correct answer is Beryllium (Be) because it does not form a hydride directly by heating with hydrogen.
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