Name two metals which react violently with cold water W
Name two metals which react violently with cold water. Write any three observation you would make when such a metal is dropped into water. How would you identify the gas evolved, if any, during the reaction?
Please scroll down to see the correct answer and solution guide.
Right Answer is:
SOLUTION
Sodium and Potassium
Sodium
When sodium is added to water, it melts to form a ball that moves around on the surface. It fizzes rapidly, and the hydrogen produced may burn with an orange flame before the sodium disappears.
Sodium+Water⟶Sodiumhydroxide+Hydrogen
2Na(s)+2H2O(l)⟶2NaOH(aq)+H2(g)
Potassium
When potassium is added to water, it melts and floats. It moves around very quickly on the surface of the water. The hydrogen ignites instantly. The metal is also set on fire, with sparks and a lilac flame. There is sometimes a small explosion at the end of the reaction.
The reactions result in the evolution of hydrogen gas. It is identified by bringing a burning matchstick near the reaction mixture. Hydrogen gas burns with a pop sound.