Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70% ?

A. Nickel, tin and copper
B. Copper, tin and zinc
C. Copper, phosphorus and nickel
D. Manganese, phosphorus and nickel

A. Hammer
B. Workpiece
C. Die with hammer
D. Weight on hammer

A. Very high cost
B. Rather low tensile strength
C. Very low strength to weight ratio
D. Scarce availability

A. Refractory
B. Reinforced
C. Abrasive
D. Fully metallic

A. Glass
B. Nickel
C. Neoprene
D. Either B. or C.