Question:
Which of the following elements does not form its hydroxide and Dihydrogen with water?
Which of the following elements does not form its hydroxide and Dihydrogen with water?
Show Hint
Beryllium is unreactive towards water because of a protective oxide layer, unlike its heavier group members.
Updated On: Nov 12, 2026
- Barium
- Calcium
- Magnesium
- Beryllium
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Reactivity of group 2 metals with water increases down the group.
Step 2: Heavier members
Calcium and barium react with cold water, and magnesium reacts with hot water, giving the hydroxide and dihydrogen: \(\text{M}+2\text{H}_2\text{O}\rightarrow\text{M(OH)}_2+\text{H}_2\).
Step 3: Beryllium
Beryllium does not react with water even at high temperature, since a protective oxide film forms on its surface.
Step 4: Compare the options
So the answer is option (D).
Final Answer:
Beryllium does not form its hydroxide and dihydrogen with water. \[ \boxed{\text{(D) }\text{Beryllium}} \]
Reactivity of group 2 metals with water increases down the group.
Step 2: Heavier members
Calcium and barium react with cold water, and magnesium reacts with hot water, giving the hydroxide and dihydrogen: \(\text{M}+2\text{H}_2\text{O}\rightarrow\text{M(OH)}_2+\text{H}_2\).
Step 3: Beryllium
Beryllium does not react with water even at high temperature, since a protective oxide film forms on its surface.
Step 4: Compare the options
So the answer is option (D).
Final Answer:
Beryllium does not form its hydroxide and dihydrogen with water. \[ \boxed{\text{(D) }\text{Beryllium}} \]
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