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Pig iron is the most impure form of iron and contains highest proportion of carbon (2.5–4%).

1. K2Cr2O7 + 2NaOH → K2CrO4 + Na2CrO4 + H2O
2. Hence CrO42− ion is obtained.
3. Although Cu2+ state is more stable than Cu+, but Cu+ ion can be stabilized by formation of insoluble substances such as CuCl, CuCN and CuSCN. Cu2+ is more stable than Cu+ because of its high hydration energy.
4. Stainless steel contains 73% Fe, 18% Cr and 8% Ni.

Correct answer: Stainless steel contains 73% Fe, 18% Cr and 8% Ni.

Solution

Option D is correct because it provides accurate information about the composition of stainless steel, which is a well-known alloy of iron. The other options are unrelated to the question about pig iron.

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