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Chemistry

Chapter 1 - Transition Elements and Iron Metallurgy

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Lesson 4: Iron Chemical Properties, Reactions and Oxides — Lesson quiz

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1.
Why does iron react with dilute hydrochloric acid to form iron(II) chloride rather than iron(III) chloride?
The evolved hydrogen gas acts as a reducing agent preventing Fe3+ formation
Chlorine is too electronegative
Iron(III) chloride is insoluble in water
Hydrochloric acid is an oxidizing acid
2.
What is the exact chemical deduction according to Egyptian curriculum standards for: Electronic Configuration of the First Transition Series?
Scandium (Sc: 21) exhibits stable oxidation states of +1, +2, and +3
Zinc (Zn: 30) is considered a typical transition element in all its compounds
Chromium (Cr: 24) has an anomalous configuration [Ar] 4s1 3d5 to achieve half-filled d-subshell stability, and Copper (Cu: 29) is [Ar] 4s1 3d10 for completely filled d-subshell stability
Both Chromium and Copper have fully filled 4s2 orbitals
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