Some Basic Concepts Of Chemistry Question 123

Question: When FeS2 is burnt in air, it converts into Fe2O3. The change in percentage by weight of iron in the process is (Fe = 56)

Options:

A) 23% increase

B) 12% decrease

C) 12% increase

D) no change

Show Answer

Answer:

Correct Answer: A

Solution:

[a] FeS256+32×2=120,Fe56120×100=46.67,Fe2O356×2+3×16,=160,112160×100,=,70, Percent increase = 70 – 46.67 = 23% (approx.)



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