Question

table 1:4 Appearance and H Hardness of Materials Object /material / appearance ( shiny / Dull ) Hardness ( very hard / not very hard iron coal sulphur Aluminium copper --------?

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Answer 1

Answer:

Iron Shiny Very hard 

Coal Dull Not very hard

Sulphur Dull Not very hard

Aluminium Shiny Very hard

Copper Shiny Very hard..