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Corrosion of metal is
Undesirable change
Chemical change
Irreversible change
All of these
Corrosion of metal is an undesirable, irreversible chemical change.
The chemical formula of rust is
FeO. H2O
Fe2O3.xH2O
Fe3O4.xH2O
Fe2O3
The chemical formula of rust is Fe2O3.xH2O.
The oxide layer of aluminium is ……….. Hence, further corrosion of metal is prohibited.
Non-protective and porous
Protective and non-porous
Non-porous and non-protective
Protective and porous
The oxide layer of aluminium is protective and non-porous. Hence, further corrosion of metal is prohibited.
Rancidity of food can be prevented by
Refrigeration
Addition of antioxidants
Storing food containers in air tight containers
Rancidity of food can be prevented by refrigeration, storing food containers in air tight containers and by addition of antioxidants.
A reaction is said to be an oxidation reaction when there is
Addition of oxygen
Removal of hydrogen
Addition of oxygen and/or removal of hydrogen
None of these
A reaction is said to be an oxidation reaction when there is addition of oxygen and/or removal of hydrogen.
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