Metal React With Water
Metals React With Water
Metals React with Water:
Metals react with water and produce a metal oxide and hydrogen gas. Metal oxides that are soluble in water dissolve in it to further form metal hydroxide. But all metals do not react with water.
Metal + Water → Metal oxide + Hydrogen
Metal oxide + Water → Metal hydroxide
Metals like potassium and sodium react violently with cold water. In case of sodium and potassium, the reaction is so violent and exothermic that the evolved hydrogen immediately catches fire.
2K(s) + 2H2O(l) → 2KOH(aq) + H2(g) + heat energy
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) + heat energy
The reaction of calcium with water is less violent. The heat evolved is not sufficient for the hydrogen to catch fire.
Which of the following are correct : (a) Metals like potassium and sodium react violently with cold water. (b) Metals like gold and silver react violently with cold water. | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct : (a) Metals like aluminium, iron and zinc do not react either with cold or hot water. (b) Metals such as lead, copper, silver and gold do not react with water at all. (c) Metals such as lead, copper, silver and gold are highly reactive with water at all. | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct : (a) Metals react with water and produce a metal oxide and helium gas. (b) Metals like potassium and sodium react violently with cold water. (c) Metals react with water and produce a metal oxide and hydrogen gas. | |||
| Right Option : B | |||
| View Explanation | |||
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