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(C) Metals react with water or dilute mineral acids to produce hydrogen gas in the form of $H_2$ molecules,which is known as dihydrogen.For example: $

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Dihydrogen

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(C) Metals react with water or dilute mineral acids to produce hydrogen gas in the form of $H_2$ molecules,which is known as dihydrogen.For example: $Mg(s) + 2H_2O(l) 	o Mg(OH)_2(aq) + H_2(g) \uparrow$Similarly,with dilute acids: $Zn(s) + 2HCl(aq) 	o ZnCl_2(aq) + H_2(g) \uparrow$

The action of water or dilute mineral acids on metals can give:

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