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Question

Which one on reaction with NaOH solution gives inflammable gas?
  1. S

  2. Zn

  3. NH4Cl

  4. I2


Solution

The correct option is B

Zn


Zn+2H2O+2NaOHNa2Zn(OH)4+H2

As you can see - Zinc liberates hydrogen gas.
 

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