Question detail
Which of the following describes the reaction of barium with hydrochloric acid?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Group 2, the alkaline earth metals
Question
- A. Barium reacts to form barium chloride and hydrogen gas.
- B. Barium reacts to form barium sulfate and hydrogen gas.
- C. Barium does not react with hydrochloric acid.
- D. Barium reacts to form barium hydroxide and chlorine gas.
Answer
Barium reacts to form barium chloride and hydrogen gas.
Explanation
When barium reacts with hydrochloric acid, it produces barium chloride (BaCl2) and hydrogen gas (H2), demonstrating its reactivity with acids.
Common mistake
Misunderstanding Group 2 Metal Reactivity
Students often confuse the reactivity of Group 2 metals with non-metals, thinking they react similarly with oxygen, water, and acids.
To clarify, remember that Group 2 metals react with oxygen to form metal oxides, with water to produce hydroxides and hydrogen gas, and with acids to yield salts and hydrogen gas. For example, the reaction of magnesium with water can be represented as: 1. **Formula**: Mg + 2H2O → Mg(OH)2 + H2 2. **Substitution**: Here, magnesium reacts with water to form magnesium hydroxide and hydrogen gas. 3. **Working**: The magnesium displaces hydrogen from water, resulting in the formation of magnesium hydroxide. 4. **Answer**: The products are magnesium hydroxide (Mg(OH)2) and hydrogen gas (H2). 5. **Units/Conclusion**: This shows that Group 2 metals react with water to produce hydroxides, which is a key characteristic of their reactivity.
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