a metal which reacts with dilute hcl forming insoluble coating and further reaction stops
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Answered by
27
Answer:
Copper and mercury metal does not react with dilute hydrochloric acid as it comes after hydrogen in the activity series, i.e., they can't replace hydrogen from hydrochloric acid..
Answered by
3
Answer:
1) Concentrated nitric acid renders the iron passive through - a small amount of Fe
2
O
3
is formed and coats the metal, but that cannot be oxidised any further and the reaction then stops.
2) Conc nitric acid is a strong oxidising agent converts the metal into ferric oxide which forms an insoluble protective coating on it. Since the metal loses contact with acid, the reaction stops. A chemically active metal becomes passive- unreactive.
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