Group 2, the alkaline earth metals

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Question 6
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Two experiments are carried out to investigate the reactivity and solubility trends of Group 2 elements:

  • Experiment 1: A sample of magnesium ribbon is heated strongly in a stream of steam.
  • Experiment 2: A small piece of barium metal is added to a beaker of cold water at room temperature.

Which of the following correctly identifies the solid product formed in Experiment 1, and the pH of the solution remaining in Experiment 2 after the reaction is complete?

Solid product: MgO(s)\text{MgO(s)}MgO(s); pH of solution: Strongly alkaline (pH>12\text{pH} > 12pH>12)

Solid product: Mg(OH)2(s)\text{Mg(OH)}_2\text{(s)}Mg(OH)2​(s); pH of solution: Strongly alkaline (pH>12\text{pH} > 12pH>12)

Solid product: MgO(s)\text{MgO(s)}MgO(s); pH of solution: Weakly alkaline (pH≈8\text{pH} \approx 8pH≈8)

Solid product: Mg(OH)2(s)\text{Mg(OH)}_2\text{(s)}Mg(OH)2​(s); pH of solution: Weakly alkaline (pH≈8\text{pH} \approx 8pH≈8)

Group 2, the alkaline earth metals Questions

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