Valencian Community PAU Chemistry Practice Questions - Valencian Community PAU Chemistry (Química 2o Bachillerato) Exam - Valencian Community PAU Chemistry Practice Questions - Valencian Community PAU Chemistry (Química 2o Bachillerato) Exam

Question 1

Which set of quantum numbers (n, l, m_l, m_s) is permissible for an electron occupying a 3d orbital in a transition metal atom?

n = 3, l = 2, m_l = -2, m_s = +1/2 n = 3, l = 3, m_l = +1, m_s = -1/2 n = 3, l = 1, m_l = 0, m_s = +1/2 n = 2, l = 2, m_l = +2, m_s = -1/2

Correct Answer:

n = 3, l = 2, m_l = -2, m_s = +1/2

Question 2

What is the ground-state electron configuration of a neutral copper atom (Cu, Z = 29)?

[Ar] 3d^10 4s^1 [Ar] 3d^9 4s^2 [Ar] 3d^8 4s^2 4p^1 [Kr] 3d^10 4s^1

Correct Answer:

[Ar] 3d^10 4s^1

Question 3

Which of the following correctly orders the period 3 elements Na, Mg, Al, and Si by increasing first ionization energy (IE_1)?

Na < Al < Mg < Si Na < Mg < Al < Si Al < Na < Mg < Si Si < Mg < Al < Na

Correct Answer:

Na < Al < Mg < Si

Question 4

According to VSEPR theory, what is the molecular geometry and approximate bond angle of the ammonia molecule (NH_3)?

Trigonal pyramidal, ~107° Tetrahedral, ~109.5° Trigonal planar, 120° T-shaped, ~90°

Correct Answer:

Trigonal pyramidal, ~107°

Question 5

Why does water (H_2O, boiling point 100 °C) have a significantly higher boiling point than hydrogen sulfide (H_2S, boiling point -60 °C)?

H_2O molecules form strong intermolecular hydrogen bonds, whereas H_2S experiences weaker dipole-dipole interactions. The H-O covalent bond inside the H_2O molecule is much stronger than the H-S bond inside H_2S. H_2O has a higher molar mass than H_2S, increasing its London dispersion forces. H_2S forms ionic lattice networks in the liquid state that decompose upon boiling.

Correct Answer:

H_2O molecules form strong intermolecular hydrogen bonds, whereas H_2S experiences weaker dipole-dipole interactions.

Question 1

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Prepare with the Valencian Community PAU Chemistry Practice Questions - Valencian Community PAU Chemistry (Química 2o Bachillerato) Exam practice quiz. This question bank includes 100 questions covering reaction, rate, constant, calculate, and energy. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Valencian Community PAU Chemistry Practice Questions - Valencian Community PAU Chemistry (Química 2o Bachillerato) Exam

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

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Valencian Community PAU Chemistry Practice Questions - Valencian Community PAU Chemistry (Química 2o Bachillerato) Exam

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