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BECE Science 2013 Paper

Question : 15

Total: 40

Solution:

Concept:

Lime juice is acidic, and reactive metals react with acids to produce hydrogen gas.

Explanation:

• Lime juice contains citric acid, which provides hydrogen ions (

\mathrm{H^+}

• Magnesium is a reactive metal and displaces hydrogen from the acid:

\mathrm{Mg} + 2\mathrm{H^+} \rightarrow \mathrm{Mg^{2+}} + \mathrm{H_2 \uparrow}

• Copper, lead, and silver are less reactive and do not readily produce gas with lime juice.

Answer:

C. Magnesium

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