Materials and Construction
Concentrated HCl at 30°C can be stored in a vessel made of

Cast iron and aluminium
Stainless steel and high silicon cast iron
None of these
PTFE and porcelain

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Materials and Construction
Duriron is

Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion
High silicon iron
All of these
Acid resistant, brittle and very hard

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