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Question 1
Which set of quantum numbers (n, l, ml, ms) represents a valid electron state in an isolated atom according to the Pauli exclusion principle and quantum mechanical rules?
Correct Answer:
n = 4, l = 2, ml = -1, ms = +1/2
Question 2
What is the ground-state electronic configuration of the gaseous iron(III) cation, Fe3+ (atomic number Z = 26)?
Correct Answer:
[Ar] 3d5
Question 3
According to Slater's rules, what is the effective nuclear charge (Zeff) experienced by a 4s valence electron in a ground-state neutral zinc atom (Zn, Z = 30, electronic configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2)?
Correct Answer:
4.35
Question 4
An unknown main-group element X in Period 3 displays the following successive ionization energies (in kJ/mol): IE1 = 578, IE2 = 1817, IE3 = 2745, IE4 = 11578, IE5 = 14842. In which IUPAC group of the periodic table is element X located?
Correct Answer:
Group 13
Question 5
Use the Born-Haber cycle data to calculate the lattice energy (ΔH_lattice) of calcium fluoride, CaF2(s), defined as CaF2(s) -> Ca2+(g) + 2 F-(g). Given: ΔHf°[CaF2(s)] = -1228 kJ/mol; Sublimation enthalpy of Ca(s) = +178 kJ/mol; First ionization energy of Ca = +590 kJ/mol; Second ionization energy of Ca = +1145 kJ/mol; F-F bond dissociation energy = +158 kJ/mol (for F2 -> 2 F); Electron affinity of F(g) = -328 kJ/mol.
Correct Answer:
+2643 kJ/mol
Question 1
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Prepare with the OBQ Practice Questions - Olimpíada Brasileira de Química Exam practice quiz. This question bank includes 100 questions covering reaction, constant, rate, energy, and cell. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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OBQ Practice Questions - Olimpíada Brasileira de Química Exam

This practice set contains 100 questions from the matching question bank and focuses on reaction, constant, rate, energy, and cell. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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