Engineering Materials
Pick up wrong statement about wrought iron

It melts at 1535°C
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
It is very soft and ductile
It contains carbon of the order of 0 to 0.25%

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Engineering Materials
Cyaniding is the process of

Reacting steel surface with cyanide salts
Dipping steel in cyanide bath
Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
Obtaining cyanide salts

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Engineering Materials
Malleable cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is produced by annealing process. It is soft, tough, and easily machined metal

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