Question

a metal which floatson the surface of cold water and reacts with it to form hydrigen gas​

Answer 1

Answer:

All of Group 1 elements—lithium, sodium, potassium, rubidium and cesium react vigorously or even explosively with cold water. In each case, the aqueous metal hydroxide and hydrogen gas are produced, as shown: 2 X (s) +2 H 2 O (l) →2XO H (aq) + H 2(g) where X is any Group 1 metal.

Answer 2

Answer:

Explanation:

Lithium's density is only about half that of water, so it floats on the surface, fizzing and giving off hydrogen gas. It gradually reacts and disappears, forming a colorless solution of lithium hydroxide