Difference between the action of concentrated acids and dilute acids on metals.

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Solution

Dilute acids act as general acids liberating $H_{2}$ gas when they react with metals. Concentrated acids, on the other hand, exhibit their special properties when in the concentrated state. Conc. $H_{2} S O_{4}$ acts as a dehydrating agent. It pulls out an $H_{2} O$ molecule from the compound to which it is exposed. Conc. $H N O_{3}$ acts as a strong oxidizing agent.

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