Materials and Construction
Out of the following, copper vessels are the most suitable for the storage of

Phosphoric acid (95%) & sulphuric acid (95% and fuming)
Nitric acid (95% and fuming)
Dry chlorine & dry fluorine
Bromine

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Materials and Construction
Lead

Can not be work hardened
Is the lightest metal in common use
Is the hardest metal in common use
Can not be scratched by finger nails

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