Question

answer this question asap

Answer 1

sodium and potassium
Potassium metal reacts very rapidly with water to form a colourless solution of potassium hydroxide (KOH) and hydrogen gas (H2). 
Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2).

Answer 2

As the most reactive metals are sodium and potassium.
So, The reaction is following:-
2K + 2H2O:- 2KOH+ H2
Here, The gas is hydrogen.
Now, when,
Na + H2O:-NaOH + H2

Hope this will help u..