The metals will produces hydrogen gas when added to solution containing a strong acid are aluminum, magnesium and zinc, etc.
Those reactions in which displacement of only one element will done by another element for the formation of product takes place will known as single displacement reaction.
Metals have the propeties to react with acids and will produce hydrogen gas, so those metals which are more reactive than hydrogen atoms and are present above the hydrogen atom in the electrochemical series will displace hydrogen from acids and produces hydrogen gas. Some of them are aluminum, magnesium, zinc, etc.
Hence metals are aluminum, magnesium and zinc, etc are the metals.
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