La Rioja PAU Chemistry Practice Questions - La Rioja PAU Chemistry Examination (Química 2o Bachillerato Universidad de La Rioja 2026) Exam - La Rioja PAU Chemistry Practice Questions - La Rioja PAU Chemistry Examination (Química 2o Bachillerato Universidad de La Rioja 2026) Exam

Question 1

Which set of quantum numbers (n, l, m_l, m_s) correctly describes the highest-energy valence electron in a ground-state sodium atom (Na, Z = 11)?

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

Correct Answer:

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

Question 2

How does atomic radius change across Period 3 elements from sodium (Na) to chlorine (Cl), and what is the primary cause?

It increases because additional electron shells are filled. It decreases because effective nuclear charge increases while core electron shielding remains nearly constant. It remains constant because shielding by inner electrons completely cancels the increased nuclear charge. It decreases because electron-electron repulsions force electrons closer to the nucleus.

Correct Answer:

It decreases because effective nuclear charge increases while core electron shielding remains nearly constant.

Question 3

What is the ground-state electronic configuration of copper (Cu, Z = 29)?

[Ar] 4s² 3d⁹ [Ar] 4s¹ 3d¹⁰ [Ar] 4s⁰ 3d¹¹ [Ar] 4s² 3d¹⁰

Correct Answer:

[Ar] 4s¹ 3d¹⁰

Question 4

The first ionization energy of nitrogen (N, Z = 7) is 1402 kJ/mol, whereas that of oxygen (O, Z = 8) is 1314 kJ/mol. Which statement accounts for this anomaly?

Nitrogen has a smaller atomic radius than oxygen. Oxygen has a higher effective nuclear charge than nitrogen. Nitrogen possesses a half-filled 2p subshell (2p³), providing extra exchange energy stability, while oxygen has paired electrons in a 2p orbital that experience inter-electron repulsion. Nitrogen's 2s orbital is lower in energy than oxygen's 2s orbital.

Correct Answer:

Nitrogen possesses a half-filled 2p subshell (2p³), providing extra exchange energy stability, while oxygen has paired electrons in a 2p orbital that experience inter-electron repulsion.

Question 5

Which of the following orders correctly arranges the isoelectronic species S²⁻, Cl⁻, K⁺, and Ca²⁺ by decreasing ionic radius?

S²⁻ > Cl⁻ > K⁺ > Ca²⁺ Ca²⁺ > K⁺ > Cl⁻ > S²⁻ Cl⁻ > S²⁻ > Ca²⁺ > K⁺ K⁺ > Ca²⁺ > S²⁻ > Cl⁻

Correct Answer:

S²⁻ > Cl⁻ > K⁺ > Ca²⁺

Question 1

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Prepare with the La Rioja PAU Chemistry Practice Questions - La Rioja PAU Chemistry Examination (Química 2o Bachillerato Universidad de La Rioja 2026) Exam practice quiz. This question bank includes 100 questions covering reaction, rate, calculate, constant, and standard. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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La Rioja PAU Chemistry Practice Questions - La Rioja PAU Chemistry Examination (Química 2o Bachillerato Universidad de La Rioja 2026) Exam

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

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La Rioja PAU Chemistry Practice Questions - La Rioja PAU Chemistry Examination (Química 2o Bachillerato Universidad de La Rioja 2026) Exam

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