The reaction of acids with metals is an example of reaction.

displacement

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combination

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double displacement

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Solution

The correct option is A displacement
Metals that are more reactive than hydrogen can displace it from the acids to form metallic salts and hydrogen gas.
2M(s) + 2HA(aq) →2MA(aq)+ $H_{2}$ (g)
2Na(s) + 2HCl(aq) →2NaCl(aq)+ $H_{2}$ (g)

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