A clean strip of calcium metal is added to cold water and the reaction is observed. Compared to sodium and magnesium, which of the following statements correctly describes calcium's reactivity and the nature of products formed?

Question

A clean strip of calcium metal is added to cold water and the reaction is observed. Compared to sodium and magnesium, which of the following statements correctly describes calcium's reactivity and the nature of products formed? — Exam MCQ

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A. Calcium reacts less vigorously than sodium but more than magnesium, forming calcium hydroxide and hydrogen gas. — Calcium reacts less vigorously than sodium but more than magnesium, forming calcium hydroxide and hydrogen gas: Ca + 2H2O → Ca(OH)2 + H2. Calcium is positioned below sodium but above magnesium in the reactivity series; consequently, its reaction with cold water is steady and manageable compared to the violent, explosive reaction of sodium. During the reaction, the calcium metal often starts to float because the bubbles of hydrogen gas produced stick to the surface of the metal pieces.

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B. Calcium does not react with cold water but only with steam, forming calcium oxide and hydrogen gas.

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C. Calcium reacts slowly with cold water, producing calcium oxide and oxygen gas.

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D. Calcium reacts explosively like sodium, forming calcium hydroxide and hydrogen gas.

A clean strip of calcium metal is added to cold water and the reaction is observed. Compared to sodium and magnesium, which of the following statements correctly describes calcium's reactivity and the nature of products formed?

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