Determine the empirical formula of an oxide of Iron which has 69.9 % iron and 30.1 % dioxygen by mass.

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Fe2O3
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How can one do well in class 11 and 12 (CBSE) without coaching?
Without coaching you have to ref NCERT books. Go through mathematical and science concepts first, learn the formulae and then go for attmpting different MCQ's. By having sufficient practise you will gain confidenece. Best Luck
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Can I pass class 11 and 12 with good marks without any coaching?
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Hydrogen peroxide is ._________ . (a) an oxidizing agent (b) a reducing agent (c) both an oxidizing and a reducing agent (d) neither oxidizing nor reducing agent.
(c) both an oxidizing and a reducing agent. Hydrogen peroxide in acid solution is oxidized with KMnO4 and reduced with KI. When H2O2 serves as an oxidizing agent, the oxygen is reduced to H2O. When H2O2...
Shilpa
Which one of the following alkaline earth metal carbonates is thermally most stable? (a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3
MgCO3 is most stable alkaline earth metal because it is present in first period.Due to this its nuclear charge is less as compare to other.Due to its less nuclear charge its bond length is small thus it is more stable.
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