When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass=40) and liberates a gas Z which easily catches fire. Identify X,Y and Z and also write the reaction involved.

When a metal X is treated with cold water, it gives a basic salt Y wit

1.	When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass=40) and liberates a gas Z which easily catches fire. Identify X,Y and Z and also write the reaction involved.
Answer» Solution :Sodium (Na) and potassium (K) react with COLD WATER to form basic SALT. NaOH and KOH respectively . The MOLECULAR mass of NaOH is 40. So, X is Na and Y is NaOH. The gas liberated during the REACTION is hydrogen `(H_2)`. So Z is `H_2` `2Na+2H_2 O to 2NaOH+H_2+ Heat energy`