Angola 12th Grade Chemistry National Exam Practice Questions - Angola 12th Grade National Examination - Chemistry (Exame Nacional de Química 12.a Classe - INADE MED) Exam - Angola 12th Grade Chemistry National Exam Practice Questions - Angola 12th Grade National Examination - Chemistry (Exame Nacional de Química 12.a Classe

Question 1

How many protons, neutrons, and electrons are present in a neutral atom of phosphorus-31 (atomic number Z = 15, mass number A = 31)?

15 protons, 16 neutrons, 15 electrons 15 protons, 31 neutrons, 15 electrons 16 protons, 15 neutrons, 16 electrons 15 protons, 16 neutrons, 16 electrons

Correct Answer:

15 protons, 16 neutrons, 15 electrons

Question 2

Which of the following represents a valid set of quantum numbers (n, l, ml, ms) for an electron in a 3d subshell?

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

Correct Answer:

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

Question 3

What is the correct ground-state electron configuration of a neutral chromium atom (Cr, Z = 24)?

[Ar] 4s1 3d5 [Ar] 4s2 3d4 [Ar] 3d6 [Ar] 4s2 4p4

Correct Answer:

[Ar] 4s1 3d5

Question 4

Why is the first ionization energy of nitrogen (N, Z = 7) higher than that of oxygen (O, Z = 8), despite oxygen having a higher nuclear charge?

Oxygen has a paired electron in one of its 2p orbitals, resulting in increased electron-electron repulsion that makes it easier to remove Nitrogen has a smaller atomic radius than oxygen, holding its outer electrons more tightly Oxygen's outer electrons experience significantly greater shielding from inner core electrons Nitrogen has a completely filled 2p subshell, giving it noble gas stability

Correct Answer:

Oxygen has a paired electron in one of its 2p orbitals, resulting in increased electron-electron repulsion that makes it easier to remove

Question 5

Which of the following correctly arranges the isoelectronic species S2-, Cl-, K+, and Ca2+ in order of decreasing ionic radius (largest to smallest)?

S2- > Cl- > K+ > Ca2+ Ca2+ > K+ > Cl- > S2- K+ > Ca2+ > S2- > Cl- Cl- > S2- > Ca2+ > K+

Correct Answer:

S2- > Cl- > K+ > Ca2+

Question 1

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Prepare with the Angola 12th Grade Chemistry National Exam Practice Questions - Angola 12th Grade National Examination - Chemistry (Exame Nacional de Química 12.a Classe - INADE MED) Exam practice quiz. This question bank includes 88 questions covering mass, constant, reaction, solution, and molar. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Angola 12th Grade Chemistry National Exam Practice Questions - Angola 12th Grade National Examination - Chemistry (Exame Nacional de Química 12.a Classe - INADE MED) Exam

This practice set contains 88 questions from the matching question bank and focuses on mass, constant, reaction, solution, and molar. 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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Angola 12th Grade Chemistry National Exam Practice Questions - Angola 12th Grade National Examination - Chemistry (Exame Nacional de Química 12.a Classe - INADE MED) Exam

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