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Chemistry

Chapter 1 - Transition Elements and Iron Metallurgy

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Chapter 5 - Organic Chemistry

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Quiz

Lesson 2: Qualitative Analysis of Basic Radicals (Cations) — Lesson quiz

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1.
What happens when excess sodium hydroxide solution is added to the white gelatinous precipitate of aluminum hydroxide?
It dissolves completely forming soluble sodium meta-aluminate
It turns into a reddish-brown precipitate
It evolves ammonia gas
No change occurs because it is insoluble in alkalis
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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