Which filler is suitable for joining iron and silver which are insoluble in each other ?

Which filler is suitable for joining iron and silver which are insoluble in each other?

a. iron
b. silver
c. copper
d. none of the above

Correct Answer : c. copper

Explanation :

As iron and silver are insoluble in each other none between both of them can be used as a filler for joining them. Copper is soluble in both the iron and silver. Thus copper can be used as a filler.