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Use the re activity series :

A.calcium is not used for household articles.
B.copper is used for making water pipes and not lead. why?
C.powdered magnesium is used in fireworks.
D.gold is an excellent material for filling the cavity in teeth.


A. calcium can be easily broken so such a delicate thing cannot be used.
b.Lead is water soluble so it can be easily dissolve in water and leakage occur . While copper does not react with water.
c. Magnesium burn to produce blazzing white light . So it is used in firework and it also burn easily.
d. Gold is highly mealiable . so it can be used to fill cavity

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