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Explain why hydrogen gas is given off when a reactive metal undergoes a single-displacement reaction with water.
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Explain why hydrogen gas is given off when a reactive metal undergoes a single-displacement reaction with water.

User PonyEars
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hydrogen gas is given off when a reactive metal undergoes a single-displacement reaction with water is because the very active metals react with water. For example, calcium reacts with water to form calcium hydroxide and hydrogen gas etc.
User Rendy Del Rosario
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