Which metal among zinc, sodium, tin, and iron would be in a passive state when treated with concentrated HNO3?
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Correct option is Al
Nitric acid (dilute or conc) renders aluminium passive.
Because when aluminium comes into contact with nitric acid, an impervious layer of aluminium oxide is formed. This layer of aluminium oxide will prevent the nitric acid from coming into contact with the inner aluminium metal.
Hence Answer is Al
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