METALLURGY

METALLURGY

by rajeswari radhakrishnan

​CHEMICAL PROPERTIES OF COPPER,IRON AND ALUMINIUM.

​REACTION WITH OXYGEN

​

​2 Cu + O₂ + CO₂ + H₂O → CuCO₃.Cu(OH)₂ GREEN LAYERS

​

​2 Cu + O₂------->( below 1370K) 2 CuO

​

(copper II oxide- black)

​

4 Cu + O₂------>( above 1370K) 2 Cu₂O

(copper I oxide – red)

​REACTION OF ALUMINIUM WITH OXYGEN(AIR)

​4 Al + 3 O₂ → 2 Al₂O₃(Aluminium oxide)

2 Al + N₂ → 2 AlN (Aluminium nitride)

​

​

REACTION OF IRON WITH AIR​

3 Fe + 2 O₂ ----->Fe₃O₄ (black)​

MAGNETIC OXIDE​

​

​4 Fe+ 3 O2 + x H2O ----->)2 Fe2O3 . xH2O(rust)

Multiple Choice

When iron is

exposed to moist air, it forms a layer of

• brown hydrated ferric oxide

• ferrous oxide

• copper oxide

• FeO

Fill in the Blanks

Copper gets

covered with a green layer of basic copper

carbonate in the presence of CO2 and moisture.

The formula for green layer is -----------.

Poll

On heating at 800 °C, aluminium

burns very brightly forming ------ and

----------.

• Al₂O₃(Aluminium oxide)&

    AlN (Aluminium nitride)

• Al₂O₃(Aluminium oxide)&

     (Aluminium chloride)

• Al2O3(Aluminium oxide)&

   (Aluminium sulphate)

• Al2O3(Aluminium oxide)

  &

  Aluminium nitatrate