Materials and Construction
Polythene (low or high density) containers are not corroded by

Sulphur trioxide at 60°C
Nitric acid (95%) at room temperature
Sulphuric acid (10%) at room temperature
Any of these

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Materials and Construction
Pure nickel is

Not resistant to oxidation at high temperature
Ferromagnetic above its curie point (i.e., 415°C)
Ferromagnetic at room temperature
Having h.c.p. crystal lattice

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