makes the iron soft and easily machinable

increases hardness and brittleness

makes the iron white and hard

aids fusibility and fluidity

by adding magnesium to molten cast iron

by quick cooling of molten cast iron

from white cast iron by annealing process

none of the these

nickel

chromium

copper

magnesium

by adding magnesium to molten cast iron

by quick cooling of molten cast iron

from white cast iron by annealing process

none of these

white cast iron

nodular cast iron

malleable cast iron

alloy cast iron