Question 6. Sodium and Calcium react vigorously with water and Magnesium reacts with hot water to form Magnesium Oxide. Name two metals which react violently with cold water. Na + 2 H 2 O ———-> 2NaOH + H 2 . Compound B reacts with C O 2 to form a white precipitate of compound C. Identify A, B, C. Also write the equations involved. 3. Additionally, beryllium has a resistant outer oxide layer that lowers its reactivity at lower temperatures. If the gas evolved burns with a 'pop' sound, it indicates that it is hydrogen gas. Hence sodium is more reactive than magnesium. (i) name a metal that reacts more violently with cold water than does potassium. Required fields are marked *. 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