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Materials and Construction

Materials and Construction
__________ is a donor impurity for semi-conductors.

Antimony
Gallium
None of these
Boron

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Materials and Construction
Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.

Tin and wood
High silicon iron, Kel-F and teflon
Stainless steel
Silicone rubber

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Materials and Construction
Mild steel storage vessels are suitable for the storage of

Sulphuric acid (25%)
Anhydrous ammonia
Hydrochloric acid (95%)
Fatty acids

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Materials and Construction
Gunmetal and bronze are not corroded by the action of

Wet chlorine
Nitric acid (< 25%)
Hydrochloric acid (10%)
Synthetic detergent solution

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Materials and Construction
Rotary driers are generally made of

Mild steel
High silicon iron (14% Si)
Cast iron
Tin lined with refractory bricks

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Materials and Construction
A material capable of undergoing large permanent deformation, when subjected to compression is termed as

Brittle
Malleable
None of these
Ductile

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