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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

NCERT Class X
Science - Exemplar Problems

Chapter_Metals and Non Metals

Answer :

kvnmurty
salt Y:  X OH - molecular mass = 40..
so  atomic mass of X is  40 - 16 - 1 = 23... So it is sodium.
so  Y =  sodium hydroxide.

Sodium + water ===  sodium hydroxide + hydrogen gas...
gas Z is hydrogen gas...

Answer:

x is sodium or potassium metal

y is sodium hydroxide or potassium hydroxide

z is hydrogen gas

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