Question 1
Which set of quantum numbers (n, l, ml, ms) is valid for the highest-energy valence electron of a ground-state chlorine atom (Z = 17)?
Correct Answer:
(3, 1, 0, +1/2)
Question 2
What is the ground-state electron configuration of a neutral chromium atom (Z = 24)?
Correct Answer:
[Ar] 3d⁵ 4s¹
Question 3
Which of the following general trends correctly describes the first ionization energy across Period 3 elements from sodium to argon?
Correct Answer:
It increases overall due to increasing effective nuclear charge Z*.
Question 4
Calculate the de Broglie wavelength of an electron (mass m = 9.11 × 10⁻³¹ kg) moving at a velocity of 2.00 × 10⁶ m/s. (Planck's constant h = 6.63 × 10⁻³⁴ J·s).
Correct Answer:
0.364 nm
Question 5
A metal surface has a work function (threshold energy) W₀ = 4.41 × 10⁻¹⁹ J. What is the threshold frequency f₀ required to emit photoelectrons? (h = 6.63 × 10⁻³⁴ J·s).
Correct Answer:
6.65 × 10¹⁴ Hz
Question 1
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Prepare with the Extremadura PAU Chemistry Practice Questions - Extremadura PAU Chemistry Exam - Química 2o Bachillerato UEx 2026 Exam practice quiz. This question bank includes 100 questions covering calculate, energy, constant, equilibrium, and reaction. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Extremadura PAU Chemistry Practice Questions - Extremadura PAU Chemistry Exam - Química 2o Bachillerato UEx 2026 Exam

This practice set contains 100 questions from the matching question bank and focuses on calculate, energy, constant, equilibrium, and reaction. 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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