Answers

2015-02-06T19:39:04+05:30
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

6 3 6