Which of the following solutions containing only hydroxyl ions will liberate, hydrogen gas when reacted with magnesium metal?

A. \(1.0 \times 10^{-12} \mathrm{~mol} \mathrm{dm}^{-3}\)  
B. \(1.0 \times 10^{-6} \mathrm{~mol} \mathrm{} \mathrm{dm}^{-3}\)
C. \(1.0 \times 10^{-4} \mathrm{~mol} \mathrm{dm}^{-3}\)
D. \(1.0 \times 10^{-2} \mathrm{~mol} \mathrm{} \mathrm{dm}^{-3}\)

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Correct Answer: A