11. Lequel des métaux suivants prend feu lors de la réaction avec l'air? A. Magnésium B. Manganèse C. Potassium D. Calcium
Answer. Explanation: Sodium and potassium both are extremely reactive and react with air as well as water vigorously. The reactions are highly exothermic and hence, the hydrogen gas evolved as byproduct catches fire.
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