If the gas evolved burns with a 'pop' sound, it indicates that it is hydrogen gas. MEDIUM. Check Answer and Solution for ab General. The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table - they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen.. The Facts. These metals react with cold water with increasing vigor to give the metal hydroxide and hydrogen. She is writing some statements about “metals and non-metals” but she confused to … None of the above View Answer; Q6 Pratibha is taking preparation for her final examination. Of the three metals X, Y and Z. X reacts with cold water, Y with hot water and Z with steam only. Reaction of aluminium metal with water: Reaction of aluminium metal with cold water is too slow to come into notice. Sodium and potassium metals react violently with cold water. Which metals do not react with cold as well as hot water ... Na, Ca and Mg are reactive metals and quickly react with water. 3Fe + 4H 2 O → Fe 3 O 4 + 4H 2. Na + 2 H 2 O ———-> 2NaOH + H 2 . [D]. It uses these reactions to explore the trend in reactivity in Group 1. Name the three metals which react with cold water to form hydrogen gas. The Group 1 metal (M) is oxidised to its metal ions, and water is reduced to hydrogen gas (H 2) and hydroxide ion (OH −), giving a general equation of: At room temperature, the reaction of Fe is very slow but red hot iron reacts with steam to form Fe 3 O 4 with hydrogen gas. Metal starts reacting with water causing little explosions. 3. Metal starts moving over the surface of water making a hissing sound. Magnesium metal react with cold water to form magnesium hydroxide and hydrogen. All metals, if they do react with water at all, react faster in steam than in water. This page looks at the reactions of the Group 1 elements - lithium, sodium, potassium, rubidium and caesium - with water. 2. Calcium and the metals that are more reactive than calcium in the reactivity series can react with cold water to form the corresponding hydroxide while liberating hydrogen gas. A metal which does not react with cold water but reacts with steam to liberate H2 gas is (A) Na (B) Mg (C) Au (D) Fe. 1)Sodium is a very reactive metal,therefore sodium metal react violently even with cold water. N a, K, R b reacts readily with water to form hydrogen gas & corresponding hydroxide. However, the metals that react SLOWLY with cold water are the metals from Group-IIA(Magnesium, Calcium, etc). Calcium, for example, reacts fairly vigorously and exothermically with cold water. Answer. Observations: 1. All of these metals react vigorously or even explosively with cold water. Support your answer with equally balanced chemical equations. 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