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When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH

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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

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  • X is Na because molecular mass of NaOH is 40. 
  • Hence Y is NaOH 
  • Z is hydrogen has which catches fire when reacts with water. 

2Na + 2H2O → 2NaOH + H2

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