The only alkaline earth metal which releases H2 gas when reacted with alkalies is:
Correct answer: A. Be
- A. Be
- B. Mg
- C. Ca
- D. Sr
Explanation
Beryllium is the only alkaline earth metal that releases hydrogen gas (H2) when reacted with alkalies (strong bases like sodium hydroxide, NaOH). The reaction of beryllium with alkalis forms beryllium hydroxide (Be(OH)2) and hydrogen gas.
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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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