Welcome to chemistry afns test 9, an advanced online preparation module designed for candidates preparing for the Armed Forces Nursing Services (AFNS) initial academic entrance test. This practice quiz focuses on key FSc Chemistry concepts and high-frequency multiple-choice questions needed to clear your computer-based military exam with high marks.
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#1. Which sub-shell has the highest energy?
#2. Magnetic quantum number values for the d-subshell are
#3. A p-orbital has ______ energy than an s-orbital of the same principal quantum number.
#4. In gases and liquids, temperature is the measure of the kinetic energies of molecules:
#5. The molar volume of nitrogen gas is maximum at:
#6. 8g of methane and 2g of hydrogen are mixed and kept at 760 mm pressure at 273 K. The total volume occupied by the mixture will be:
#7. Which of the following has the strongest intermolecular forces?
#8. What type of force exists between ions and water molecules?
#9. Which forces are present between all types of atoms and molecules?
#10. Ionic solids are characterized by:
#11. Which solids are called true solids?
#12. Which ionic solid has highest lattice energy
#13. Which of the following is NOT a state function?
#14. A state function is a property that:
#15. The total energy of a system is called:
#16. According to the first law of thermodynamics:
#17. Internal energy (E) change is equal to
#18. In the equation ΔE = q – PΔV, what does PΔV represent?
#19. Which of the following statement about atomic radius is generally TRUE across a period from left to right in the periodic table?
#20. Which factor is primarily responsible for the increase in atomic radius down a group in the periodic table?
#21. For isoelectronic species, what is the relationship between ionic radius and nuclear charge?
#22. How does atomic radius generally change as you move from left to right across a period in the periodic table?
#23. Covalent radius is typically defined as half the distance between the nuclei of two identical atoms joined by a:
#24. Anion is always larger than its parent atom because ___.
#25. Which of the following blocks in the periodic table primarily contains transition elements?
#26. The general electronic configuration for the valence shell of d-block transition elements is:
#27. Which of the following electronic configurations represents a d-block element?
#28. For the reaction: 4NH3+5O2 ⇌ 4NO+6H2O The units of the equilibrium constant (Kc) are:
#29. One mole of HI was sealed in a tube and heated at 440°C until equilibrium was reached. If HI was found to be 50% dissociated, the equilibrium constant Kc for the reaction is:
#30. For what value of Kc is the forward reaction almost complete?
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CHEMISTRY TEST 9
Welcome to chemistry afns test 9, an advanced online preparation module designed for candidates preparing for the Armed Forces Nursing Services (AFNS) initial academic entrance test. This practice quiz focuses on key FSc Chemistry concepts and high-frequency multiple-choice questions needed to clear your computer-based military exam with high marks.
Key Topics Covered in Chemistry AFNS Test 9
To score high in the official AFNS entry exam, make sure to thoroughly revise these core chemical principles tested in this module:
- Electrochemistry & Redox Reactions: Oxidation numbers, electrochemical cells, standard reduction potentials, and electrolysis principles.
- Chemical Equilibrium & Kinetics: Dynamic equilibrium, Le Chatelier’s principle, equilibrium constants, rate laws, and reaction orders.
- Transition Elements & Coordination Compounds: d-block element properties, complex ion formation, ligands, and color changes in transition metals.
- Organic Reactions & Mechanisms: Nucleophilic substitutions, elimination reactions, electrophilic additions, and functional group identifications.
Effective Revision Tips for Test 9
- Review FSc Textbooks: Go through core definitions, chemical formulas, and reaction mechanisms in your 1st-year and 2nd-year FSc Chemistry textbooks.
- Analyze Missed Questions: Inspect your incorrect choices after completing the quiz to identify weak areas and clear lingering doubts.
- Pace Yourself: Practice completing questions rapidly to build speed and accuracy for the actual timed computer exam.
Useful Resources & Next Steps
- Next Quiz: Move forward to practice Chemistry AFNS Test 10.
- Main Hub: Access All AFNS Chemistry Practice Quizzes to attempt tests in order.
- Official Information: For official entry test schedules and eligibility criteria, visit the Join Pak Army Official Website.
High-Frequency Sample MCQs for Practice
3. Catalyst used in Haber’s process for the synthesis of ammonia is:
A) Nickel
B) Platinum
C) Iron with traces of alumina
D) Vanadium pentoxide
Answer: C) Iron with traces of alumina
4. Which type of isomerism is shown by 1-butanol and 2-butanol?
A) Chain isomerism
B) Position isomerism
C) Functional group isomerism
D) Metamerism
Answer: B) Position isomerism
5. The minimum energy required to initiate a chemical reaction is called:
A) Kinetic energy
B) Activation energy
C) Potential energy
D) Enthalpy
Answer: B) Activation energy
Effective Revision Tips for Test 9
- Review FSc Textbooks: Go through core definitions, chemical formulas, and reaction mechanisms in your 1st-year and 2nd-year FSc Chemistry textbooks.
- Analyze Missed Questions: Inspect your incorrect choices after completing the quiz to identify weak areas and clear lingering doubts.
- Pace Yourself: Practice completing questions rapidly to build speed and accuracy for the actual timed computer exam.
Useful Resources & Next Steps
- Next Quiz: Move forward to practice Chemistry AFNS Test 10.
- Main Hub: Access All AFNS Chemistry Practice Quizzes to attempt tests in order.
- Official Information: For official entry test schedules and eligibility criteria, visit the Join Pak Army Official Website.
Chemistry Academic Test Preparation: Nuclear Chemistry & Radioactivity
Radioactive Decay, Half-Life Calculations, Nuclear Fission & Fusion Reactions
Nuclear chemistry bridges physics and chemistry, exploring the behavior of atomic nuclei, radioactive decay kinetics, and energy transformations. In the recruitment tests for the Pakistan Army, Navy, and Air Force, candidates are often evaluated on their understanding of alpha, beta, and gamma emissions, mass-energy equivalence equations, half-life periods, and nuclear reactor principles. A firm foundation in these concepts is vital for clearing technical academic exams.
Remember that alpha emission decreases the atomic number by 2 and mass number by 4, whereas beta emission increases the atomic number by 1 while keeping the mass number unchanged.
Key Syllabus Topics in Chemistry Quiz 9
- Natural and Artificial Radioactivity: Discovery of radioactivity, properties of alpha particles ($He^{2+}$), beta particles ($e^-$), and gamma rays (high-energy photons), and nuclear stability belt concepts.
- Radioactive Decay Law and Half-Life: First-order decay kinetics, mathematical equations for radioactive decay, calculation of half-life ($t_{1/2} = 0.693 / \lambda$), and radioactive dating principles.
- Nuclear Fission and Fusion: Mechanics of induced nuclear fission in uranium-235, chain reactions, critical mass, and nuclear fusion reactions powering stars and thermonuclear weapons.
- Applications of Radioisotopes: Medical diagnostics and radiotherapy (Cobalt-60, Iodine-131), carbon dating in archaeology, and radioactive tracers in industrial pipelines.
Einstein’s Mass-Energy Relation
Energy released during nuclear reactions is calculated using $E = \Delta m \cdot c^2$, where $\Delta m$ represents the mass defect (difference between total mass of individual nucleons and the actual nuclear mass).
Take Chemistry Quiz 9 below to assess your understanding of nuclear reactions and radioactive decay calculations.