give reason
aluminium is more reactive than iron,yet there is less corrosion of alumium when both are exposed to air
Reaction of nitric acid with metals generally does not evolve hydrogen gas
Metals displace hydrogen from dilute acids whereas non-metals do not
give reason
aluminium is more reactive than iron,yet there is less corrosion of alumium when both are exposed to air
Reaction of nitric acid with metals generally does not evolve hydrogen gas
Metals displace hydrogen from dilute acids whereas non-metals do not
1) Both Al and Fe oxidise in air, however the oxide layer of Al behaves as a protective layer and prevents further oxidation of surface. Whereas the oxide of Fe (rust) is not protective in nature and does not prevent oxidation.
2) Inspite of being an acid Nitric acid behaves as a strong oxidising agent, So when H+ ions are formed in the reaction they are oxidised to water by HNO3
The reaction is given as:
2H + + NO3 - = NO2 + H2 O
3) Hydrogen gas can be replaced only by 2 types of elements a) they must form +ve ions and b) must be more reactive than Hydrogen
1) Both Al and Fe oxidise in air, however the oxide layer of Al behaves as a protective layer and prevents further oxidation of surface. Whereas the oxide of Fe (rust) is not protective in nature and does not prevent oxidation.
2) Inspite of being an acid Nitric acid behaves as a strong oxidising agent, So when H+ ions are formed in the reaction they are oxidised to water by HNO3
The reaction is given as:
2H + + NO3 - = NO2 + H2 O
3) Hydrogen gas can be replaced only by 2 types of elements a) they must form +ve ions and b) must be more reactive than Hydrogen
