Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas d'Acceso á Universidade) Exam - Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas d'Acceso á Universidade) Exam

Question 1

Which set of quantum numbers (n, l, ml, ms) is allowed for a valence electron in a ground-state sulfur atom (Z = 16)?

n = 3, l = 1, ml = -1, ms = -1/2 n = 3, l = 2, ml = 0, ms = +1/2 n = 2, l = 1, ml = +1, ms = -1/2 n = 3, l = 1, ml = +2, ms = +1/2

Correct Answer:

n = 3, l = 1, ml = -1, ms = -1/2

Question 2

What is the ground-state electron configuration of the iron(III) ion, Fe³⁺ (Z = 26)?

[Ar] 3d⁵ [Ar] 4s² 3d³ [Ar] 4s¹ 3d⁴ [Ar] 3d⁶

Correct Answer:

[Ar] 3d⁵

Question 3

Why is the first ionization energy of phosphorus (Z = 15) higher than that of sulfur (Z = 16)?

Phosphorus has a stable half-filled 3p³ subshell, whereas sulfur has paired electrons in one 3p orbital experiencing electron-electron repulsion. Sulfur has a smaller nuclear charge than phosphorus, resulting in weaker attraction for valence electrons. Phosphorus has a significantly smaller atomic radius than sulfur. Sulfur's valence electrons are shielded by an extra inner electron shell.

Correct Answer:

Phosphorus has a stable half-filled 3p³ subshell, whereas sulfur has paired electrons in one 3p orbital experiencing electron-electron repulsion.

Question 4

Which list arranges the isoelectronic species N³⁻, O²⁻, F⁻, Na⁺, Mg²⁺ in order of DECREASING ionic radius?

N³⁻ > O²⁻ > F⁻ > Na⁺ > Mg²⁺ Mg²⁺ > Na⁺ > F⁻ > O²⁻ > N³⁻ F⁻ > O²⁻ > N³⁻ > Mg²⁺ > Na⁺ N³⁻ > F⁻ > O²⁻ > Na⁺ > Mg²⁺

Correct Answer:

N³⁻ > O²⁻ > F⁻ > Na⁺ > Mg²⁺

Question 5

Given standard enthalpies for NaCl formation: Sublimation of Na(s) = +107 kJ/mol, 1st Ionization Energy of Na(g) = +496 kJ/mol, Bond dissociation of Cl₂(g) = +244 kJ/mol, Electron affinity of Cl(g) = -349 kJ/mol, and Standard enthalpy of formation ΔH°f(NaCl, s) = -411 kJ/mol. Calculate the lattice enthalpy (ΔH_lattice) for NaCl(s) → Na⁺(g) + Cl⁻(g).

+787 kJ/mol +665 kJ/mol +388 kJ/mol +909 kJ/mol

Correct Answer:

+787 kJ/mol

Question 1

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Prepare with the Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas d'Acceso á Universidade) Exam practice quiz. This question bank includes 100 questions covering reaction, equilibrium, calculate, temperature, and solution. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas d'Acceso á Universidade) Exam

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Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas d'Acceso á Universidade) Exam

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