Question

why is reaction of Na with H2O is explosive whereas Ca with H2O is not?

Answer 1

Answer:

sodium reacts with water to form sodium hydroxide and as sodium is more reactive than calcium the reaction is less violent the hydrogen gas evolved stick to the surface of calcium and as a result calcium floats on the surface

Answer 2

Explanation:

There are two answers for this question

Answer No.1 :-

Sodium is Alkali metal and Calcium is Alkaline Earth Metal

So Alkali metals are highly reactive than Alkaline Earth Metals

Answer No.2 :-

In reactivity series Sodium is in second place and Calcium is in third place

Reactivity Series:-

K , Na, Ca, Mg, Al, Zn, Fe, Pb, H, Cu, Hg, Ag, Au