Question:
Which of the following is obtained when dihydrogen reacts with the alkali metals at high temperature?
Which of the following is obtained when dihydrogen reacts with the alkali metals at high temperature?
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Hydrogen takes an electron from the alkali metal to form H$^-$.
Updated On: Oct 1, 2026
- Alkoxides
- Metal hydrides
- Peroxides
- Metal nitrites
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The Correct Option is B
Solution and Explanation
Step 1: Recall the reaction
At high temperature, dihydrogen combines with alkali metals to give ionic hydrides:
\[ 2\text{M}+\text{H}_2\xrightarrow{\Delta}2\text{MH} \]
Step 2: Check
Alkoxides need an alcohol. Peroxides form with oxygen. Nitrites need nitrogen and oxygen. So only metal hydrides fit, option (B).
Final Answer:
The product is a metal hydride, option (B). \[ \boxed{\text{(B)}} \]
At high temperature, dihydrogen combines with alkali metals to give ionic hydrides:
\[ 2\text{M}+\text{H}_2\xrightarrow{\Delta}2\text{MH} \]
Step 2: Check
Alkoxides need an alcohol. Peroxides form with oxygen. Nitrites need nitrogen and oxygen. So only metal hydrides fit, option (B).
Final Answer:
The product is a metal hydride, option (B). \[ \boxed{\text{(B)}} \]
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