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

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

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Materials and Construction
Lead

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

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