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NEET2015ChemistryHydrogenActual

Which of the following reactions produces hydrogen?

Options

  1. AMg + H ₂ O
  2. BH ₂ ~S ₂ O ₈+ H ₂ O
  3. CBaO ₂+ HCl
  4. DNa ₂ O ₂+2 HCl

Correct answer

A. Mg + H ₂ O

Step-by-step solution

Alkali and alkaline earth metals react with water to produce hydrogen gas and metal hydroxides. This is due to their high electropositive character. Mg +2 H ₂ O Mg ( OH )₂+ H ₂

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