Given below are two statements.
Statement I : Pig iron is obtained by heating cast iron with scrap iron.
Statement II : Pig iron has a relatively lower carbon content than that of cast iron.
In the light of the above statements, choose the correct answer from the options given below.

Solution

Chemistry ma’am · 3 steps

Pig iron comes first from the blast furnace; cast iron is made from it, so both statements run backwards.

1. Pig iron first. Iron that comes out of the blast furnace is pig iron. It has about 4% carbon, plus small amounts of S, P, Si and Mn.
2. Then cast iron. Cast iron is made by melting pig iron with scrap iron and coke under a hot air blast. Some carbon burns off, so cast iron has slightly less carbon, about 3%.

   Property	Pig iron	Cast iron
   How it is made	Directly from the blast furnace	Pig iron heated with scrap iron and coke
   Carbon content	About 4%, higher	About 3%, lower

3. So. Statement I swaps the two irons, and Statement II gets the carbon order backwards. Neither is correct, so the answer is (b).

The idea to keep. Follow the order of making: blast furnace gives pig iron (about 4% C), and remelting it with scrap iron and coke gives cast iron (about 3% C). Each refining step lowers the carbon, down to wrought iron.

Answer from the NTA final answer key. Solution by PrepWiser.