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

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2015-05-29T10:07:34+05:30

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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...

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