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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

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

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Ans.
Sodium (Na) and potassium (K) react with cold water to form basic salt NaOH and KOH respectively.
Molecular formula = XOH
Molecular mass = 40
Let the atomic weight of metal X is x
Then, molecular mass of BOH = x + 16 + 1= 40 (Given)
x = 40 – 17 = 23
Thus, metal X is sodium (Na)
Sodium reacts with water as
2Na+2H_{2}O\rightarrow 2NaOH+H_{2}
Sodium (Na) liberates hydrogen gas (Z) on reaction with cold water.
So, Y is NaOH (sodium hydroxide)
Z Is H2 (hydrogen gas).

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