All acids generate hydrogen gas on reaction with metals. Hydrogen is common to all acids. In fact all acids contain hydrogen ions (H+). A base is a substance, which on dissolving in water yields hydroxyl ions (OH-) as the only negative ions. A base may be an oxide or a hydroxide of a metal. If a base is soluble in water, it dissociates to form a metal ion and it is the only negative hydroxyl ion (OH-).
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