Neha took 10 g of fine iron filings and 5 g of Sulphur powder in a big Petri dish. She mixed them well and labelled it as A .Neha took 10g of fine iron fillings and 5 g of Sulphur powder. She mixed them well and heated first gently and then strongly and labelled it as B .Contents of petri dishes A and B were tested by dil. H₂SO₄. Which of following observation is true:
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